Targeted binding agents directed to upar and uses thereof

ABSTRACT

Targeted binding agents directed to the antigen uPAR and uses of such antibodies are described. In particular, fully human monoclonal antibodies directed to the antigen uPAR. Nucleotide sequences encoding, and amino acid sequences comprising, heavy and light chain immunoglobulin molecules, particularly sequences corresponding to contiguous heavy and light chain sequences spanning the framework regions and/or complementary determine regions (CDR&#39;s), specifically from FR1 through FR4 or CDR1 through CDR3. Hybridomas or other cell lines expressing such immunoglobulin molecules and monoclonal antibodies.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority under 35 U.S.C. §119 to U.S. Provisional Application Ser. No. 60/790,642, filed Apr. 10, 2006, the entirety of which is hereby incorporated by reference.

FIELD

The invention relates to targeted binding agents against urokinase-type plasminogen activator receptor (uPAR) and uses of such agents. More specifically, the invention relates to fully human monoclonal antibodies directed to uPAR. The described binding agents are useful as diagnostics and for the treatment of diseases associated with the activity and/or overproduction of uPAR.

BACKGROUND

The urokinase-type plasminogen activator receptor (uPAR, CD87), GenBank Accession Number NP_(—)002650, is a 55-60 kDa highly glycosylated 313 residue polypeptide that is linked to the outer leaflet of the cell membrane by a glycophosphatidylinositol (GPI)-anchor. The protein is folded into three highly homologous domains, DI, DII and DIII (Huai et al, Science 311: 656-659 2006). The N-terminal end of uPAR provides a urokinase plasminogen activator (uPA)-binding site (DI) (Gardsvoll et al, J Biol Chem 274: 37995-38003 1999). Evidence suggests that residues in domain 3 participate in the assembly of the ligand-binding site, and that domains 2 and 3 increase the affinity of uPA binding to domain 1 (Liang et al, J Biol Chem 276: 28946-28953 2001). The C-terminal domain (DIII) is processed to add a glycophosphatidylinositol (GPI)-anchor involving residues ser282, gly283, ala284. Proteolytic cleavage in the linker region between DI and DII (Hoyer-Hansen et al, Eur J Biochem 243: 21-26 1997; Andolfo et al, Thromb Hemost 88: 298-306 2002) and at residues within the C-terminal domain (Beaufort et al, J Immunol 172: 5450-549 2004) result in the presence of both a membrane anchored form comprising DII and DIII and a soluble forms of uPAR (suPAR) that comprise DI-DIII or DII-DIII. Cleavage of the glycolipid anchor may also release uPAR from the cell surface (Wilhelm et al, J Cell Physiol 180: 225-235 1999). Soluble uPAR incorporating DI retains the ability to bind urokinase (Higazi et al, J Biol Chem 270: 17375-17380 1995).

uPAR is expressed on the surface of many types of cells, including circulating leukocytes, vascular smooth muscle cells, angiogenic endothelial cells, bone marrow cells, and fibroblasts. Upregulation of uPAR expression at the cell surface, and plasminogen activation, has been linked to a number of conditions including inflammation, wound repair, arthritis (Szekanecz et al, J Clin Pathol 50: 314-319 1997), atherosclerosis (Carmeliet et al, Nature Genetics, 1-7: 439-444 1997); angiogenesis and tumor invasion and metastasis. The presence of elevated levels of soluble uPAR in plasma has been shown to be a prognostic marker in colorectal cancer (Stephens et al, J Natl Cancer Inst 91: 869-874 1999).

Activation of the inactive zymogen plasminogen to the serine protease plasmin is a key event regulating fibrinolysis. There are two plasminogen activators, tissue plasminogen activator (tPA) and urokinase plasminogen activator (uPA). Whereas tPA appears to be the key plasminogen activator in plasma, uPA is associated with cell surface plasminogen activation as a result of binding to uPAR. Urokinase is secreted as a single chain zymogen (scuPA) that exhibits very low or no intrinsic enzymatic activity. After enzymatic cleavage by plasmin, the scuPA is converted into an active, disulfide bond-linked, two-chain high molecular weight (HMW)-uPA. This HMW-uPA, is comprised of an A-chain (aa 1-158) and a B-chain, or LMW-uPA (aa 159-411). The primary interaction of uPA with uPAR is mediated through the growth factor domain (GFD) as 1-48 of uPA in the A-chain, located in the amino-terminal fragment (ATF). A second site in uPA that interacts with uPAR (connecting peptide, as 136-143) has been identified.

Binding affinity of uPA for uPAR is about 1 nM (Kd). Comparing the primary structure of uPAR among different species, human uPAR is 95% identical to that of Cynomolgus monkey (Macaca fascicularis), and only 60% identical to that of mouse (Mus musculus). Furthermore, the high affinity binding of uPA and uPAR is species specific. The affinities of the uPA for uPAR across species (e.g. human uPA to rat uPAR) differ by at least two orders of magnitude.

Cell surface recruitment of uPA to uPAR regulates cell surface plasminogen activation: scuPA is activated more efficiently when receptor bound (Ellis et al, J Biol Chem 264: 2185-2188 1989); the catalytic efficiency of receptor bound uPA is increased relative to uPA in solution phase (Higazi et al, J Biol Chem 270: 17375-17380 1995); PAI-1 is less efficient as an inhibitor of receptor bound uPA (Ellis et al, J Biol Chem 265: 9904-9908 1990). Plasminogen in turn is recruited to the cell surface through low and high affinity interactions and plasmin generation proceeds more effectively at the cell surface and is also less susceptible to its physiological inhibitors. At the tumor cell surface, plasminogen activation facilitates a number of processes that contribute to tumor progression including, activation of matrix-metalloproteases, degradation of extracellular matrix proteins, release and activation of growth factors that drive tumor growth and invasion (Andreasen et al, Int J Cancer 72: 1-22 1997).

In addition to the well established role in plasminogen activation, more recently evidence has established the role of uPAR as an adhesion receptor for vitronectin, a complex interaction that involves uPAR, uPA and PAI-1 (Waltz and Chapman, J Biol Chem-269: 14746-14750 1994; Czekay et al, J Cell Biol 160: 781-791 2003; Li et al, J Biol Chem 278: 29925-29932 2003). Cleavage of cell surface uPAR exposes an epitope on the DII domain that has been shown to be chemotactic in vitro (Degryse et al, J Biol Chem 280: 24792-24803 2005). Interactions with integrin receptors have been reported (e.g. Wei et al, J Cell Biol 168: 501-511 2005; Wei et al, Mol Biol Cell 12: 2975-2986 2001), and activation of cellular signaling pathways as a result of uPA binding have been demonstrated (reviewed in Blasi and Carmeliet, Nature Rev Mol Cell Biol 3: 932-943 2002)

Increased expression of uPAR and urokinase have been correlated with tumor progression in a range of human cancers including, breast, urinary bladder, gastric cancer, endometrial cancer, colorectal cancer (Edo de Bock and Wang, Med Res Reviews 24: 13-39 2004). uPAR gene expression is increased by tumor promoters, growth factors, cytokines and hormones as well as by atherogenic lipoproteins or hypoxia. Immunohistochemical and in situ hybridization studies have shown the uPA/uPAR complex to be localized to the invasive edge of a tumor, (Pyke et al, Am J Pathol 138: 1059-1067 1991) and correlated with tumor invasion. High expression levels of each uPA, uPAR or PAI-1 is linked to poor prognosis in different types of tumors (Duffy and Duggan, Clin Biochem 37: 541-548 2004).

Others have shown that a polyclonal urokinase receptor antibody can reduce tumor volume and detect the presence of occult tumor metastases in vivo (Rabbani and Gladu, Cancer Res. 62:2390-7 2002). Adenovirus mediated delivery of the uPA-ATF (Li et al, Gene Therapy 5 1105-1113 1998; Human Gene Therapy 16: 1157-1167 2005), stable transfection of uPA-ATF (Zhu et al, DNA Cell Biol 20: 297-305 2001), anti-sense uPAR (Mohan et al, Cancer Res 59: 3369-3373 1999) or combined antisense uPAR/uPA (Gondi et al, Oncogene 22: 5967-5975 2003) resulted in blockade or loss of uPAR activity and inhibition of invasion in vitro and tumor growth and invasion in vivo. In addition, a peptide derived from the non-receptor binding region of urokinase plasminogen activator (uPA) inhibited tumor progression and angiogenesis and induced tumor cell death in vivo (Guo et al, FASEB J. 14:1400-1410 2000).

SUMMARY

Embodiments of the invention relate to fully human targeted binding agents that specifically bind to uPAR and thereby inhibit plasminogen activation and activation of certain matrix-metalloproteases. The targeted binding agents also inhibit tumor cell adhesion and/or invasion, and/or cellular metastasis. In addition, the targeted binding agents are useful for reducing tumor growth. Mechanisms by which this can be achieved can include and are not limited to either inhibiting binding of uPA to its receptor uPAR, inhibiting uPAR/uPA localized uPA enzymatic activity, abrogation of intereactions with integrins or extracellular matrix proteins such as vitronectin, thereby reducing the effective concentration of uPAR.

Thus one embodiment of the invention is a targeted binding agent that specifically binds to uPAR and inhibits binding of uPA to uPAR. The targeted binding agent may bind uPAR with a K_(d) of less than 100 μM, 10 μM, 1 μM, 100 nM, 10 nM, 1 nM, 500 pM, 400 pM, 300 pM, 200 pM, 100 pM or 50 pM.

Yet another embodiment is a targeted binding agent that binds to uPAR and inhibits greater than 90% of plasminogen activation on U937 cells at antibody concentrations as low as 100 μg/ml, 10 μg/ml, 8 μg/ml, 6 μg/ml, 4 μg/ml, 2 μg/ml, 1 μg/ml, 100 ng/ml, 10 ng/ml, 1 ng/ml, or 100 pg/ml or less.

Yet another embodiment is a targeted binding agent that binds to uPAR and inhibits plasminogen activation on U937 cells with an IC₅₀ of less than 10 μg/ml, 1 μg/ml, 0.1 μg/ml, 0.08 μg/ml, 0.06 μg/ml, 0.04 μg/ml, 0.02 μg/ml or 0.01 μg/ml.

Yet another embodiment is a targeted binding agent that binds to uPAR and inhibits greater than 90% of uPAR-mediated cell adhesion of U937 cells to vitronectin at targeted binding agent concentrations as low as 100 μg/ml, 10 μg/ml, 8 μg/ml, 6 μg/ml, 4 μg/ml, 2 μg/ml, 1 μg/ml, 100 ng/ml, 10 ng/ml, 1 ng/ml, or 100 pg/ml or less. Yet another embodiment is a targeted binding agent that binds to uPAR and inhibits greater than 80% of uPAR-mediated cell adhesion of U937 cells to vitronectin at targeted binding agent concentrations as low as 100 μg/ml, 10 μg/ml, 8 μg/ml, 6 μg/ml, 4 μg/ml, 2 μg/ml, 1 μg/ml, 100 ng/ml, 10 ng/ml, 1 ng/ml, or 100 pg/ml or less.

Yet another embodiment is a targeted binding-agent that binds to uPAR and inhibits greater than 90% of invasion of HT-1080 cells through Matrigel™ at targeted binding agent concentrations as low as 1000 μg/ml, 100 μg/ml, 10 μg/ml, 8 μg/ml, 6 μg/ml, 4 μg/ml, 2 μg/ml, 1 μg/ml, 100 ng/ml, 10 ng/ml, 1 ng/ml or 100 pg/ml or less.

In another embodiment the targeted binding agent may comprise a sequence comprising any one of the complementarity determining regions (CDR), CDR1, CDR2 or CDR3 sequences as shown in Table 18. In another embodiment the targeted binding agent may comprise a sequence comprising any two of a CDR1, CDR2 or CDR3 sequence as shown in Table 18 (that is either a CDR1 and CDR2, a CDR1 and CDR3, or a CDR2 and CDR3). In another embodiment the targeted binding agent may comprise a sequence comprising a CDR1, CDR2 and CDR3 sequence as shown in Table 18. It is noted that those of ordinary skill in the art can readily accomplish CDR determinations. See for example, Kabat et al., Sequences of Proteins of Immunological Interest, Fifth Edition, NIH Publication 91-3242, Bethesda Md. (1991), vols. 1-3.

In another embodiment the targeted binding agent may comprise a sequence comprising any one of a CDR1, CDR2 or CDR3 sequence as shown in Table 18. In another embodiment the targeted binding agent may comprise a sequence comprising any two of a CDR1, CDR2 or CDR3 sequence as shown in Table 18 (that is either a CDR1 and CDR2, a CDR1 and CDR3 or a CDR2 and CDR3). In another embodiment the targeted binding agent may comprise a sequence comprising a CDR1, CDR2 and CDR3 sequence as shown in Table 18.

In another embodiment the targeted binding agent may comprise a sequence comprising any one of a CDR1, CDR2 or CDR3 sequence as shown in Table 19. In another embodiment the targeted binding agent may comprise a sequence comprising any two of a CDR1, CDR2 or CDR3 sequence as shown in Table 19 (that is either a CDR1 and CDR2, a CDR1 and CDR3 or a CDR2 and CDR3). In another embodiment the targeted binding agent may comprise a sequence comprising a CDR1, CDR2 and CDR3 sequence as shown in Table 19.

In another embodiment the targeted binding agent may comprise a sequence comprising any one of a CDR1, CDR2 or CDR3 sequence of any one of either fully human monoclonal antibody 2.19.2 (ATCC Accession Number PTA-7474), 2.6.1 (ATCC Accession Number PTA-7475) or 4.18.1 (ATCC Accession Number PTA-7476), as shown in Table 18. In another embodiment the targeted binding agent may comprise a sequence comprising any two of a CDR1, CDR2 or CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 18 (that is either a CDR1 and CDR2, a CDR1 and CDR3 or a CDR2 and CDR3). In another embodiment the targeted binding agent may comprise a sequence comprising a CDR1, CDR2 and CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 18.

In another embodiment the targeted binding agent may comprise a sequence comprising any one of a CDR1, CDR2 or CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 19. In another embodiment the targeted binding agent may comprise a sequence comprising any two of a CDR1, CDR2 or CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 19 (that is either a CDR1 and CDR2, a CDR1 and CDR3 or a CDR2 and CDR3). In another embodiment the targeted binding agent may comprise a sequence comprising a CDR1, CDR2 and CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 19.

In another embodiment the targeted binding agent comprises a sequence comprising any one of a CDR1, CDR2 or CDR3 sequence as shown in Table 18 and any one of a CDR1, CDR2 or CDR3 sequence as shown in Table 19. In another embodiment the targeted binding agent comprises any two of a CDR1, CDR2 or CDR3 sequence shown in Table 18 and any two of a CDR1, CDR2 or CDR3 sequence as shown in Table 19 (that is either a CDR1 and CDR2, a CDR1 and CDR3 or a CDR2 and CDR3). In another embodiment the targeted binding agent comprises a CDR1, CDR2 and CDR3 sequence as shown in Table 18 and a CDR1, CDR2 and CDR3 sequence as shown in Table 19.

In another embodiment the targeted binding agent comprises a sequence comprising any one of a CDR1, CDR2 or CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 18, and any one of a CDR1, CDR2 or CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 19. In another embodiment the targeted binding agent comprises any two of a CDR1, CDR2 or CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 18, and any two of a CDR1, CDR2 or CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 19 (that is either a CDR1 and CDR2, a CDR1 and CDR3 or a CDR2 and CDR3). In another embodiment the targeted binding agent comprises a CDR1, CDR2 and CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 18, and a CDR1, CDR2 and CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 19.

In another embodiment the targeted binding agent comprises a sequence comprising a CDR1, CDR2 and CDR3 sequence of fully human monoclonal antibody 2.19.2 as shown in Table 18, and a CDR1, CDR2 and CDR3 sequence of fully human monoclonal antibody 2.19.2 as shown in Table 19. In another embodiment the targeted binding agent comprises a sequence comprising a CDR1, CDR2 and CDR3 sequence of fully human monoclonal antibody 2.6.1 as shown in Table 18, and a CDR1, CDR2 and CDR3 sequence of fully human monoclonal antibody 2.6.1 as shown in Table 19. In another embodiment the targeted binding agent comprises a sequence comprising a CDR1, CDR2 and CDR3 sequence of fully human monoclonal antibody 4.18.1 as shown in Table 18, and a CDR1, CDR2 and CDR3 sequence of fully human monoclonal antibody 4.18.1 as shown in Table 19.

In one embodiment of the invention, the targeted binding agent is an antibody. In one embodiment of the invention, the targeted binding agent is a monoclonal antibody. In one embodiment of the invention, the targeted binding agent is a fully human monoclonal antibody.

In another embodiment there is an antibody that binds to uPAR and comprises a light chain amino acid sequence comprising any one of a CDR1, CDR2 or CDR3 sequence as shown in Table 19. In another embodiment there is an antibody that binds to uPAR and comprises a light chain amino acid sequence comprising any two of a CDR1, CDR2 or CDR3 sequence as shown in Table 19 (that is either a CDR1 and CDR2, a CDR1 and CDR3 or a CDR2 and CDR3). In another embodiment there is an antibody that binds to uPAR and comprises a light chain amino acid sequence comprising a CDR1, a CDR2 and a CDR3 sequence as shown in Table 19. In certain embodiments the antibody is a fully human monoclonal antibody.

Yet another embodiment is an antibody that binds to uPAR and comprises a heavy chain amino acid sequence comprising any one of a CDR1, CDR2 or CDR3 sequence as shown in Table 18. In another embodiment there is an antibody that binds to uPAR and comprises a heavy chain amino acid sequence comprising any two of a CDR1, CDR2 or CDR3 sequence as shown in Table 18 (that is either a CDR1 and CDR2, a CDR1 and CDR3 or a CDR2 and CDR3). In another embodiment there is an antibody that binds to uPAR and comprises a heavy chain amino acid sequence comprising a CDR1, a CDR2 and a CDR3 sequence as shown in Table 18. In certain embodiments the antibody is a fully human monoclonal antibody.

In another embodiment the antibody that binds to uPAR may comprise an amino acid sequence comprising any one of a CDR1, CDR2 or CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 18. In another embodiment the antibody may comprise an amino acid sequence comprising any two of a CDR1, CDR2 or CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 18 (that is either a CDR1 and CDR2, a CDR1 and CDR3 or a CDR2 and CDR3). In another embodiment the antibody may comprise an amino acid sequence comprising a CDR1, CDR2 and CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 18.

In another embodiment the antibody that binds to uPAR may comprise an amino acid sequence comprising any one of a CDR1, CDR2 or CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 19. In another embodiment the antibody may comprise an amino acid sequence comprising any two of a CDR1, CDR2 or CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 19 (that is either a CDR1 and CDR2, a CDR1 and CDR3 or a CDR2 and CDR3). In another embodiment the antibody may comprise an amino acid sequence comprising a CDR1, CDR2 and CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 19.

In another embodiment the antibody that binds to uPAR comprises a heavy chain amino acid sequence comprising any one of a CDR1, CDR2 or CDR3 sequence as shown in Table 18 and a light chain amino acid sequence comprising one of a CDR1, CDR2 or CDR3 sequence as shown in Table 19. In another embodiment the antibody comprises a heavy chain amino acid sequence comprising any two of a CDR1, CDR2 or CDR3 sequence as shown in Table 18 and a light chain amino acid sequence comprising any two of a CDR1, CDR2 or CDR3 sequence as shown in Table 19 (that is either a CDR1 and CDR2, a CDR1 and CDR3 or a CDR2 and CDR3). In another embodiment the antibody comprises a heavy chain amino acid sequence comprising a CDR1, CDR2 and CDR3 sequence as shown in Table 18 and a light chain amino acid sequence comprising a CDR1, CDR2 and CDR3 sequence as shown in Table 19.

In another embodiment the antibody that binds to uPAR comprises a heavy chain amino acid sequence comprising any one of a CDR1, CDR2 or CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 18 and a light chain amino acid sequence comprising any one of a CDR1, CDR2 or CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 19. In another embodiment the antibody comprises a heavy chain amino acid sequence comprising any two of a CDR1, CDR2 or CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 18 and a light chain amino acid sequence comprising any two of a CDR1, CDR2 or CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 19 (that is either a CDR1 and CDR2, a CDR1 and CDR3 or a CDR2 and CDR3). In another embodiment the antibody comprises a heavy chain amino acid sequence comprising a CDR1, CDR2 and CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 18 and a light chain amino acid sequence comprising a CDR1, CDR2 and CDR3 sequence of either fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1 as shown in Table 19.

In another embodiment the antibody comprises a heavy chain amino acid sequence comprising a CDR1, CDR2 and CDR3 sequence of fully human monoclonal antibody 2.19.2 as shown in Table 18 and a light chain amino acid sequence comprising a CDR1, CDR2 and CDR3 sequence of fully human monoclonal antibody 2.19.2 as shown in Table 19. In another embodiment the antibody comprises a heavy chain amino acid sequence comprising a CDR1, CDR2 and CDR3 sequence of fully human monoclonal antibody 2.6.1 as shown in Table 18 and a light chain amino acid sequence comprising a CDR1, CDR2 and CDR3 sequence of fully human monoclonal antibody 2.6.1 as shown in Table 19. In another embodiment the antibody comprises a heavy chain amino acid sequence comprising a CDR1, CDR2 and CDR3 sequence of fully human monoclonal antibody 4.18.1 as shown in Table 18 and a light chain amino acid sequence comprising a CDR1, CDR2 and CDR3 sequence of fully human monoclonal antibody 4.18.1 as shown in Table 19.

A further embodiment of the invention is a targeted binding agent which cross-competes for binding to uPAR with the targeted binding agent or antibodies of the invention. In another embodiment of the invention there is an antibody which cross-competes for binding to uPAR with the targeted binding agent or antibodies of the invention.

In another embodiment the targeted binding agent or antibody cross-competes for binding to uPAR with any one of fully human monoclonal antibodies 2.19.2, 2.6.1 and 4.18.1. In one embodiment of the invention is an antibody which cross-competes with any one of fully human monoclonal antibodies 2.19.2, 2.6.1 and 4.18.1 for binding to uPAR.

A further embodiment of the invention is a targeted binding agent that binds to the same epitope on uPAR as the targeted binding agent or antibodies of the invention. In another embodiment of the invention there is an antibody that binds to the same epitope on uPAR as the targeted binding agent or antibodies of the invention.

In one embodiment of the invention is a targeted binding agent that binds to the same epitope on uPAR as any one of fully human monoclonal antibodies 2.19.2, 2.6.1 and 4.18.1. In one embodiment of the invention is an antibody that binds to the same epitope on uPAR as any one of fully human monoclonal antibodies 2.19.2, 2.6.1 and 4.18.1.

In one embodiment, the targeted binding agent comprises one or more of fully human monoclonal antibodies 2.19.2 (ATCC Accession Number PTA-7474), 2.6.1 (ATCC Accession Number PTA-7475) and/or 4.18.1 (ATCC Accession Number PTA-7476) which specifically bind to uPAR, as discussed in more detail below.

In one embodiment there is provided a targeted binding agent or antibody produced by the hybridoma selected from ATCC Accession Number PTA-7474, ATCC Accession Number PTA-7475 and ATCC Accession Number PTA-7476. In one embodiment there is provided a targeted binding agent or an antibody derivable from the antibody produced by the hybridoma selected from ATCC Accession Number PTA-7474, ATCC Accession Number PTA-7475 and ATCC Accession Number PTA-7476.

In one embodiment, the targeted binding agent comprises an antibody derivable from one or more of fully human monoclonal antibodies 2.19.2 (ATCC Accession Number PTA-7474), 2.6.1 (ATCC Accession Number PTA-7475) and/or 4.18.1 (ATCC Accession Number PTA-7476).

In one embodiment, the targeted binding agent comprises a polypeptide having the sequence of SEQ ID NO.: 26, 30 or 50. In one embodiment, the targeted binding agent comprises a polypeptide having the sequence of SEQ ID NO.: 28, 32 or 52. In one embodiment, the antibody of the invention comprises a heavy chain polypeptide having the sequence of SEQ ID NO.: 26, 30 or 50. In one embodiment, the antibody of the invention comprises a light chain polypeptide having the sequence of SEQ ID NO.: 28, 32 or 52.

In one embodiment, the targeted binding agent of the invention comprises a polypeptide comprising the sequence of SEQ ID NO.: 26, wherein the sequence has any one of the unique combination of germline and non-germline residues indicated by each row of Table 15. In one embodiment, the targeted binding agent of the invention comprises a polypeptide comprising the sequence of SEQ ID NO.: 30, wherein the sequence has any one of the unique combination of germline and non-germline residues indicated by each row of Table 13. In one embodiment, the targeted binding agent of the invention comprises a polypeptide comprising the sequence of SEQ ID NO.: 50, wherein the sequence has any one of the unique combination of germline and non-germline residues indicated by each row of Table 17. In one embodiment, the targeted binding agent of the invention comprises a polypeptide comprising the sequence of SEQ ID NO.: 28, wherein the sequence has any one of the unique combination of germline and non-germline residues indicated by each row of Table 14. In one embodiment, the targeted binding agent of the invention comprises a polypeptide comprising the sequence of SEQ ID NO.: 32, wherein the sequence has any one of the unique combination of germline and non-germline residues indicated by each row of Table 12. In one embodiment, the targeted binding agent of the invention comprises a polypeptide comprising the sequence of SEQ ID NO.: 52, wherein the sequence has any one of the unique combination of germline and non-germline residues indicated by each row of Table 16.

In one embodiment, the antibody of the invention comprises a heavy chain polypeptide comprising the sequence of SEQ ID NO.: 26, wherein the sequence has any one of the unique combination of germline and non-germline residues indicated by each row of Table 15. In one embodiment, the antibody of the invention comprises a heavy chain polypeptide comprising the sequence of SEQ ID NO.: 30, wherein the sequence has any one of the unique combination of germline and non-germline residues indicated by each row of Table 13. In one embodiment, the antibody of the invention comprises a heavy chain polypeptide comprising the sequence of SEQ ID NO.: 50, wherein the sequence has any one of the unique combination of germline and non-germline residues indicated by each row of Table 17. In one embodiment, the antibody of the invention comprises a light chain polypeptide comprising the sequence of SEQ ID NO.: 28, wherein the sequence has any one of the unique combination of germline and non-germline residues indicated by each row of Table 14. In one embodiment, the antibody of the invention comprises a light chain polypeptide comprising the sequence of SEQ ID NO.: 32, wherein the sequence has any one of the unique combination of germline and non-germline residues indicated by each row of Table 12. In one embodiment, the antibody of the invention comprises a light chain polypeptide comprising the sequence of SEQ ID NO.: 52, wherein the sequence has any one of the unique combination of germline and non-germline residues indicated by each row of Table 16.

The invention further provides methods for assaying the level of uPAR in a patient sample, comprising contacting a targeted binding agent or an anti-uPAR antibody of the invention with a biological sample from a patient, and detecting the level of binding between said antibody and uPAR in said sample. In more specific embodiments, the biological sample is blood, plasma, saliva, cerebrospinal fluid, bone marrow or urine.

In other embodiments the invention provides compositions, including a targeted binding agent of the invention or binding fragment thereof, and a pharmaceutically acceptable carrier. In other embodiments the invention provides compositions, including an antibody of the invention or binding fragment thereof, and a pharmaceutically acceptable carrier.

The invention provides methods of treating a malignant tumor in an animal by selecting an animal in need of treatment for a malignant tumor and administering to the animal a therapeutically effective dose of the targeted binding agent of the invention that binds to uPAR. In certain embodiments, the animal is human. In certain embodiments, the targeted binding agent is an antibody of the invention and may be selected from the group consisting of 2.19.2 (ATCC Accession Number PTA-7474), 2.6.1 (ATCC Accession Number PTA-7475) and 4.18.1 (ATCC Accession Number PTA-7476).

In certain embodiments, the malignant tumor can be selected from the group consisting of: melanoma, small cell lung cancer, non-small cell lung cancer, glioma, hepatocellular (liver) carcinoma, thyroid tumor, gastric (stomach) cancer, prostate cancer, breast cancer, ovarian cancer, bladder cancer, lung cancer, glioblastoma, endometrial cancer, kidney cancer, colon cancer, pancreatic cancer, esophageal carcinoma, head and neck cancers, mesothelioma, sarcomas, biliary (cholangiocarcinoma), small bowel adenocarcinoma, pediatric malignancies and epidermoid carcinoma.

Still further embodiments of the invention include methods of effectively treating an animal suffering from a cell adhesion- and/or invasion-related diseases, including selecting an animal in need of treatment for a cell adhesion- and/or invasion-related disease, and administering to the animal a therapeutically effective dose of a targeted binding agent of the invention that specifically binds to uPAR. In certain embodiments, the animal is human. In certain embodiments, the targeted binding agent is a fully human monoclonal antibody. In certain embodiments, the cell adhesion- or cell invasion-related disease is tumor metastasis. In certain embodiments, the targeted binding agent is an antibody of the invention and may be selected from the group consisting of 2.19.2 (ATCC Accession Number PTA-7474), 2.6.1 (ATCC Accession Number PTA-7475) and 4.18.1 (ATCC Accession Number PTA-7476).

Treatable cell adhesion- and invasion-related diseases include neoplastic diseases, such as, melanoma, small cell lung cancer, non-small cell lung cancer, glioma, hepatocellular (liver) carcinoma, thyroid tumor, gastric (stomach) cancer, prostate cancer, breast cancer, ovarian cancer, bladder cancer, lung cancer, glioblastoma, endometrial cancer, kidney cancer, colon cancer, pancreatic cancer, esophageal carcinoma, head and neck cancers, mesothelioma, sarcomas, biliary (cholangiocarcinoma), small bowel adenocarcinoma, pediatric malignancies and epidermoid carcinoma.

Treatable cell adhesion- and invasion-related diseases include non-neoplastic diseases, such as, inflammatory, or hyperproliferative diseases including but not limited to arthritis, atherosclerosis, allergic conjunctivitis.

Additional embodiments of the invention include methods of inhibiting uPAR induced cell adhesion and/or invasion in an animal. These methods include selecting an animal in need of treatment for uPAR induced cell adhesion and invasion, and administering to said animal a therapeutically effective dose of a targeted binding agent or fully human monoclonal antibody of the invention wherein said antibody specifically binds to uPAR.

Further embodiments of the invention include the use of a targeted binding agent or an antibody of the invention in the preparation of medicament for the treatment of cell adhesion- or invasion-related diseases in an animal, wherein said monoclonal antibody specifically binds to uPAR.

In still further embodiments, the targeted binding agents described herein can be used for the preparation of a medicament for the effective treatment of uPAR induced cell adhesion, and/or invasion in an animal, wherein said targeted binding agent specifically binds to uPAR. In still further embodiments, the antibodies described herein can be used for the preparation of a medicament for the effective treatment of uPAR induced cell adhesion, and/or invasion in an animal, wherein said antibody specifically binds to uPAR.

Embodiments of the invention described herein relate to targeted binding agents that bind uPAR and affect uPAR function. Other embodiments of the invention described herein relate to monoclonal antibodies that bind uPAR and affect uPAR function. Other embodiments relate to anti-uPAR antibodies of the invention with desirable properties from a therapeutic perspective, including high binding affinity for uPAR, the ability to neutralize uPAR in vitro and in vivo, and the ability to inhibit uPAR induced cell adhesion and/or invasion and/or tumor growth. Other embodiments relate to preparations of an anti-uPAR antibody of the invention with desirable properties from a therapeutic perspective, including high binding affinity for uPAR, the ability to neutralize uPAR in vitro and in vivo, and the ability to inhibit uPAR induced cell adhesion and/or invasion and/or tumor growth. Other embodiments relate to fully human anti-uPAR antibodies of the invention with desirable properties from a therapeutic perspective, including high binding affinity for uPAR, the ability to neutralize uPAR in vitro and in vivo, and the ability to inhibit uPAR induced cell adhesion and/or invasion and/or tumor growth. Other embodiments relate to preparations of a fully human anti-uPAR antibody of the invention with desirable properties from a therapeutic perspective, including high binding affinity for uPAR, the ability to neutralize uPAR in vitro and in vivo, and the ability to inhibit uPAR induced cell adhesion and/or invasion and/or tumor growth.

In one embodiment, the invention includes antibodies that bind to uPAR with very high affinities (Kd). For example a human, rabbit, mouse, chimeric or humanized antibody that is capable of binding uPAR with a Kd less than, but not limited to, 10⁻⁵, 10⁻⁶, 10⁻⁷, 10⁻⁹, 10⁻⁹, 10⁻¹⁰ or 10⁻¹¹M, or any range or value therein. Affinity and/or avidity measurements can be measured by KinExA® and/or BIACORE®, as described herein.

One embodiment of the invention includes isolated antibodies, or fragments of those antibodies, that bind to uPAR. As known in the art, the antibodies can be, for example, polyclonal, oligoclonal, monoclonal, chimeric, humanized, and/or fully human antibodies. Embodiments of the invention described herein also provide cells for producing these antibodies.

It will be appreciated that embodiments of the invention are not limited to any particular form of an antibody or method of generation or production. For example, the anti-uPAR antibody of the invention may be a full-length antibody (e.g., having an intact human Fc region) or an antibody fragment (e.g., a Fab, Fab′, F(ab′)₂, Fv or Dab (Dabs are the smallest functional binding units of human antibodies). In addition, the antibody may be manufactured from a hybridoma that secretes the antibody, or from a recombinantly produced cell that has been transformed or transfected with a gene or genes encoding the antibody.

Other embodiments of the invention include isolated nucleic acid molecules encoding any of the targeted binding agents, antibodies or fragments thereof as described herein, vectors having isolated nucleic acid molecules encoding anti-uPAR antibodies or a host cell transformed with any of such nucleic acid molecules. In addition, one embodiment of the invention is a method of producing an anti-uPAR antibody of the invention by culturing host cells under conditions wherein a nucleic acid molecule is expressed to produce the antibody followed by recovering the antibody. It should be realized that embodiments of the invention also include any nucleic acid molecule which encodes an antibody or fragment of an antibody of the invention including nucleic acid sequences optimized for increasing yields of antibodies or fragments thereof when transfected into host cells for antibody production.

A further embodiment includes a method of producing high affinity antibodies to uPAR by immunizing a mammal with human uPAR, or a fragment thereof, and one or more orthologous sequences or fragments thereof.

Other embodiments are based upon the generation and identification of isolated antibodies that bind specifically to uPAR. uPAR is expressed at elevated levels in cell adhesion- and/or invasion-related diseases, such as neoplastic diseases. Inhibition of the biological activity of uPAR can prevent uPAR induced cell adhesion and invasion and other desired effects.

Another embodiment of the invention includes a method of diagnosing diseases or conditions in which an antibody prepared as described herein is utilized to detect the level of uPAR in a patient sample. In one embodiment, the patient sample is blood or blood serum. In further embodiments, methods for the identification of risk factors, diagnosis of disease, and staging of disease is presented which involves the identification of the overexpression of uPAR using anti-uPAR antibodies.

Another embodiment of the invention includes a method for diagnosing a condition associated with the expression of uPAR in a cell by contacting the serum or a cell with a targeted binding agent or an anti-uPAR antibody of the invention, and thereafter detecting the presence of uPAR. Preferred conditions include cell adhesion- and/or invasion-related diseases including, but not limited to, neoplastic diseases, such as, melanoma, small cell lung cancer, non-small cell lung cancer, glioma, hepatocellular (liver) carcinoma, glioblastoma, and carcinoma of the thyroid, stomach, prostate, breast, ovary, bladder, lung, uterus, kidney, colon, and pancreas, salivary gland, and colorectum.

In another embodiment, the invention includes an assay kit for detecting uPAR in mammalian tissues, cells, or body fluids to screen for uPAR-related diseases. The kit includes a targeted binding agent or an antibody of the invention that binds to uPAR and a means for indicating the reaction of the antibody with uPAR, if present. In one embodiment, the antibody is a monoclonal antibody. In another embodiment, the antibody that binds uPAR is labeled. In still another embodiment the antibody is an unlabeled primary antibody and the kit further includes a means for detecting the primary antibody. In one embodiment, the means for detecting includes a labeled second antibody that is an anti-immunoglobulin. The antibody may be labeled with a marker selected from the group consisting of a fluorochrome, an enzyme, a radionuclide and a radiopaque material.

Other embodiments of the invention include pharmaceutical compositions having an effective amount of a targeted binding agent or an anti-uPAR antibody of the invention in admixture with a pharmaceutically acceptable carrier or diluent. In yet other embodiments, the targeted binding agent or anti-uPAR antibody of the invention, or a fragment thereof, is conjugated to a therapeutic agent. The therapeutic agent can be, for example, a toxin or a radioisotope.

Yet another embodiment includes methods for treating diseases or conditions associated with the expression of uPAR in a patient, by administering to the patient an effective amount of a targeted binding agent or an anti-uPAR antibody of the invention. The targeted binding agent or anti-uPAR antibody of the invention can be administered alone, or can be administered in combination with additional antibodies or chemotherapeutic drug or radiation therapy. For example, a monoclonal, oligoclonal or polyclonal mixture of uPAR antibodies that block cell adhesion and/or invasion can be administered in combination with a drug shown to inhibit tumor cell proliferation directly. The method can be performed in vivo and the patient is preferably a human patient. In a preferred embodiment, the method concerns the treatment of cell adhesion- and/or invasion-related diseases including, but not limited to, neoplastic diseases, such as, melanoma, small cell lung cancer, non-small cell lung cancer, glioma, hepatocellular (liver) carcinoma, glioblastoma, and carcinoma of the thyroid, stomach, prostate, breast, ovary, bladder, lung, uterus, kidney, colon, and pancreas, salivary gland, and colorectum.

In another embodiment, the invention provides an article of manufacture including a container. The container includes a composition containing a targeted binding agent or an anti-uPAR antibody of the invention, and a package insert or label indicating that the composition can be used to treat cell adhesion- and/or invasion-related diseases characterized by the overexpression of uPAR.

In some embodiments, the targeted binding agent or anti-uPAR antibody of the invention is administered to a patient, followed by administration of a clearing agent to remove excess circulating antibody from the blood.

Yet another embodiment is the use of a targeted binding agent or an anti-uPAR antibody of the invention in the preparation of a medicament for the treatment of diseases such as cell adhesion- and/or invasion-related diseases. In one embodiment, the cell adhesion- and/or invasion-related diseases include carcinoma, such as breast, ovarian, stomach, endometrial, salivary gland, lung, kidney, colon, colorectum, esophageal, thyroid, pancreatic, prostate and bladder cancer. In another embodiment, the cell adhesion- and/or invasion-related diseases include, but are not limited to, neoplastic diseases, such as, melanoma, small cell lung cancer, non-small cell lung cancer, glioma, hepatocellular (liver) carcinoma, sarcoma, head and neck cancers, mesothelioma, biliary (cholangiocarcinoma), small bowel adenocarcinoma, pediatric malignancies and glioblastoma.

Yet another embodiment is the use of a targeted binding agent or an anti-uPAR antibody of the invention in the preparation of a medicament for the treatment of a malignant tumour in an animal.

Yet another embodiment of the invention is the use of a targeted binding agent or an anti-uPAR antibody of the invention in the preparation of a medicament for the treatment of a non-neoplastic disease. Yet another embodiment of the invention is the use of a targeted binding agent or an anti-uPAR antibody of the invention in the preparation of a medicament for the treatment of inflammatory, or hyperproliferative diseases including but not limited to arthritis, atherosclerosis, allergic conjunctivitis.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a line graph showing the inhibitory effect of fifteen anti-uPAR monoclonal antibodies in a plasminogen activation inhibition assay. The dose-response relationship curve for each mAb is illustrated. The eight antibodies which exhibited the highest efficacy and potency are indicated by the vertical bracket. Bold face legends indicate antibodies which exhibited the strongest inhibition. Percentage of inhibition (“% Inhibition”) is shown as a function of antibody concentration with units of Log [mAb](μg/ml).

FIG. 2 is a line graph showing the ability of uPAR mAbs to inhibit adhesion of U937 cells to vitronectin. Shown are dose-response relationship curves for eight mAbs, as well as human and goat isotype negative controls and goat anti-uPAR positive control. Percent inhibition (“% Inhibition”) is shown as a function of antibody concentration with units of Log [mAb](ng/ml).

FIG. 3 shows the inhibitory effect of uPAR mAbs on HT-1080 invasion through Matrigel™ membrane preparation. The antibodies at concentrations of 0.1 μg/ml (top graph), 1.0 μg/ml (middle graph), and 10 μg/ml (bottom graph) were tested. The ratios of cell numbers that invade into the Matrigel™ beyond 60 micrometer (μm) with treatment versus isotype control are plotted.

FIG. 4 is a bar graph showing binding of anti-uPAR monoclonal antibodies to monkey (cynomolgus) uPAR expressed on the surface of 293T cells. The GeoMean values derived from the FACS analysis of the histograph peak shift are plotted.

FIG. 5 is a bar graph showing the effect of anti-uPAR mAbs on tumor cell invasion. The percentage of HT-1080 cells invading through Matrigel™ beyond 80 micrometer (μM) is shown for each antibody at concentrations ranging from 0.1 to 100 ng/ml is shown.

FIG. 6 shows the results of epitope binding analysis of anti-human uPAR mAbs by Western Blotting. Human-murine uPAR chimeras (His-tagged) were expressed in HEK293T cells and uPAR expression was detected using the anti-human uPAR mAbs as indicated. Lane 1—murine DI/DIII—human DII; lane 2—murine DI/DII—human DIII; lane 3—murine DI—human DI/DIII; lane 4—human DI/DII—murine DIII; lane 5—human uPAR.

FIG. 7 is a line graph showing the effect of anti-uPAR mAbs on solid tumor growth of MDA-MB231-GFP orthotopic xenografts. Mean tumor volume (in cm³) at time points post transplantation (weeks post implant) are shown for each antibody tested, and for IgG4 isotype and doxorubicin controls. Untreated control tumor growth (not shown) was not significantly different to IgG4 isotype controls.

FIGS. 8A-F are bar graphs showing the activity of anti-uPAR monoclonal antibodies on tumour biomarker expression, measured in primary tumors of MDA-MB231-GFP orthotopic xenografts. The data represents the mean+/−standard deviation of staining intensity (density) measured from tumors of six animals per treatment group; ki-67 (FIG. 8 a), CD31 (FIG. 8 b), MAPK (FIG. 8 c), pMAPK (FIG. 8 d), FAK (FIG. 8 e), pFAK (FIG. 5 f), including untreated, doxorubicin and IgG4 controls.

FIGS. 9A-B are bar graphs representing the activity of anti-uPAR mAbs to inhibit metastasis in mice with MDA-MB231-GFP orthotopic xenografts. The data represents the mean+/−standard deviation of the number of tumor foci in 10 fields of view in tissue sections from lung (FIG. 9A) or liver (FIG. 9B) from six animals per treatment group as indicated.

DETAILED DESCRIPTION

Embodiments of the invention relate to targeted binding agents that bind to urokinase-type plasminogen activator receptor (uPAR). In some embodiments, the binding agents bind to uPAR and inhibit the binding of urokinase-type plasminogen activator (uPA) to its receptor, uPAR. In one embodiment, the targeted binding agents are monoclonal antibodies, or binding fragments thereof.

Other embodiments of the invention include fully human anti-uPAR antibodies, and antibody preparations that are therapeutically useful. In one embodiment, preparations of the anti-uPAR antibody of the invention have desirable therapeutic properties, including strong binding affinity for uPAR, the ability to inhibit plasminogen activation in vitro, and the ability to inhibit uPAR-induced cell adhesion and invasion in vitro and in vivo.

Embodiments of the invention also include isolated binding fragments of anti-uPAR antibodies. In one embodiment the binding fragments are derived from fully human anti-uPAR antibodies. Exemplary fragments include Fv, Fab′, Dab or other well-known antibody fragments, as described in more detail below. Embodiments of the invention also include cells that express fully human antibodies against uPAR. Examples of cells include hybridomas, or recombinantly created cells, such as Chinese hamster ovary (CHO) cells, variants of CHO cells (for example DG44) and NS0 cells that produce antibodies against uPAR. Additional information about variants of CHO cells can be found in Andersen and Reilly (2004) Current Opinion in Biotechnology 15, 456-462 which is incorporated herein in its entirety by reference.

In addition, embodiments of the invention include methods of using these antibodies for treating diseases. Anti-uPAR antibodies of the invention are useful for preventing uPAR-mediated plasminogen activation, thereby inhibiting cell adhesion and/or invasion. While not being limited to any particular theory, the mechanism of action of this inhibition may include inhibition of uPA from binding to its receptor, uPAR. Anti-uPAR antibodies of the invention may also inhibit uPAR/uPA localized uPA enzymatic activity, thereby reducing the effective concentration of uPAR. Anti-uPAR antibodies of the invention may inhibit uPAR dependent adhesion of cells to vitronectin and may also disrupt uPAR modification of integrin mediated cell adhesion. Anti-uPAR antibodies of the invention may also modify intracellular signalling as a result of inhibiting uPA binding to uPAR or disruption of uPAR interactions with integrins and growth factor receptors. Diseases that are treatable through this inhibition mechanism include, but are not limited to, neoplastic diseases, such as melanoma, small cell lung cancer, non-small cell lung cancer, glioma, hepatocellular (liver) carcinoma, glioblastoma, and cancers and tumors of the thyroid, stomach, prostate, breast, ovary, bladder, lung, uterus, kidney, colon, and pancreas, salivary gland, and colorectum.

Other embodiments of the invention include diagnostic assays for specifically determining the quantity of uPAR in a biological sample. The assay kit can include anti-uPAR antibodies of the invention along with the necessary labels for detecting such antibodies. These diagnostic assays are useful to screen for cell adhesion- and invasion-related diseases including, but not limited to, neoplastic diseases, such as, melanoma, small cell lung cancer, non-small cell lung cancer, glioma, hepatocellular (liver) carcinoma, glioblastoma, and carcinoma of the thyroid, stomach, prostate, breast, ovary, bladder, lung, uterus, kidney, colon, and pancreas, salivary gland, and colorectum.

Another aspect of the invention is an antagonist of the biological activity of uPAR wherein the antagonist binds to uPAR. In one embodiment, the antagonist is a targeted binding agent, such as an antibody. The antagonist may bind to:

i) uPAR; or

ii) the uPA/uPAR complex,

or a combination of these. In one embodiment the antagonist is able to antagonize the biological activity of uPAR in vitro and in vivo. The antagonist may be selected from an antibody described herein, for example fully human monoclonal antibody 2.19.2 (ATCC Accession Number PTA-7474), 2.6.1 (ATCC Accession Number PTA-7475) and 4.18.1 (ATCC Accession Number PTA-7476).

In one embodiment the antagonist of the biological activity of uPAR may bind to uPAR and thereby prevent uPAR mediated plasminogen activation, thereby inhibiting cell adhesion and/or invasion. The mechanism of action of this inhibition may include binding of the antagonist to uPAR and inhibiting the binding of uPA to its receptor, uPAR. Without wishing to be bound by any particular theoretical considerations, mechanisms by which antagonism of the biological activity of uPAR can be achieved include, but are not limited to, inhibition of binding of uPA to the receptor uPAR, or inhibition of uPAR/uPA localized uPA enzymatic activity.

One embodiment is a targeted binding agent which binds to the same epitope or epitopes as fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1.

One embodiment is an antibody which binds to the same epitope or epitopes as fully human monoclonal antibody 2.19.2, 2.6.1 or 4:18.1.

In one embodiment, the targeted binding agent binds uPAR with a K_(d) of less than 1 nanomolar (nM). The targeted binding agent may bind with a K_(d) less than 500 picomolar (pM). The targeted binding agent may bind with a K_(d) less than 400 picomolar (pM). The targeted binding agent may bind with a K_(d) less than 300 picomolar (pM). In another embodiment, the targeted binding agent binds with a K_(d) of less than 200 μM.

One embodiment is a hybridoma that produces the targeted binding agent as described hereinabove. In one embodiment is a hybridoma that produces the light chain and/or the heavy chain of the antibodies as described hereinabove. In one embodiment the hybridoma produces the light chain and/or the heavy chain of a fully human monoclonal antibody. In another embodiment the hybridoma produces the light chain and/or the heavy chain of the fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1. Alternatively the hybridoma may produce an antibody which binds to the same epitope or epitopes as fully human monoclonal antibody 2.19.2, 2.6.1 or 4.18.1.

Another embodiment is a nucleic acid molecule encoding the targeted binding agent as described hereinabove. In one embodiment is a nucleic acid molecule encoding the light chain or the heavy chain of an antibody as described hereinabove. In one embodiment the nucleic acid molecule encodes the light chain or the heavy chain of a fully human monoclonal antibody. Still another embodiment is a nucleic acid molecule encoding the light chain or the heavy chain of a fully human monoclonal antibody selected from antibodies 2.19.2, 2.6.1 or 4.18.1.

Another embodiment of the invention is a vector comprising a nucleic acid molecule or molecules as described hereinabove, wherein the vector encodes a targeted binding agent as defined hereinabove. In one embodiment of the invention is a vector comprising a nucleic acid molecule or molecules; as described hereinabove, wherein the vector encodes a light chain and/or a heavy chain of an antibody as defined hereinabove.

Yet another embodiment of the invention is a host cell comprising a vector as described hereinabove. Alternatively the host cell may comprise more than one vector.

In addition, one embodiment of the invention is a method of producing a targeted binding, agent or of the invention by culturing host cells under conditions wherein a nucleic acid molecule is expressed to produce the targeted binding agent, followed by recovery of the targeted binding agent. In one embodiment of the invention is a method of producing an antibody of the invention by culturing host cells under conditions wherein a nucleic acid molecule is expressed to produce the antibody, followed by recovery of the antibody.

In one embodiment the invention includes a method of making an targeted binding agent by transfecting at least one host cell with at least one nucleic acid molecule encoding the targeted binding agent as described hereinabove, expressing the nucleic acid molecule in the host cell and isolating the targeted binding agent. In one embodiment the invention includes a method of making an antibody by transfecting at least one host cell with at least one nucleic acid molecule encoding the antibody as described hereinabove, expressing the nucleic acid molecule in the host cell and isolating the antibody.

According to another aspect, the invention includes a method of antagonising the biological activity of uPAR by administering an antagonist as described herein. The method may include selecting an animal in need of treatment for disease-related cell adhesion and/or invasion, and administering to the animal a therapeutically effective dose of an antagonist of the biological activity of uPAR.

Another aspect of the invention includes a method of antagonising the biological activity of uPAR by administering a targeted binding agent as described hereinabove. The method may include selecting an animal in need of treatment for disease-related cell adhesion and/or invasion, and administering to the animal a therapeutically effective dose of a targeted binding agent which antagonises the biological activity of uPAR.

Another aspect of the invention includes a method of antagonising the biological activity of uPAR by administering an antibody as described hereinabove. The method may include selecting an animal in need of treatment for disease-related cell adhesion and/or invasion, and administering to the animal a therapeutically effective dose of an antibody which antagonises the biological activity of uPAR.

According to another aspect there is provided a method of treating disease-related cell adhesion and/or invasion in a mammal by administering a therapeutically effective amount of an antagonist of the biological activity of uPAR. The method may include selecting an animal in need of treatment for disease-related cell adhesion and/or invasion, and administering to the animal a therapeutically effective dose of an antagonist of the biological activity of uPAR.

According to another aspect there is provided a method of treating disease-related cell adhesion and/or invasion in a mammal by administering a therapeutically effective amount of a targeted binding agent which antagonizes the biological activity of uPAR. The method may include selecting an animal in need of treatment for disease-related cell adhesion and/or invasion, and administering to the animal a therapeutically effective dose of a targeted binding agent which antagonises the biological activity of uPAR. The targeted binding agent can be administered alone, or can be administered in combination with additional antibodies or chemotherapeutic drugs or radiation therapy.

According to another aspect there is provided a method of treating disease-related cell adhesion and/or invasion in a mammal by administering a therapeutically effective amount of an antibody which antagonizes the biological activity of uPAR. The method may include selecting an animal in need of treatment for disease-related cell adhesion and/or invasion, and administering to the animal a therapeutically effective dose of an antibody which antagonises the biological activity of uPAR. The antibody can be administered alone, or can be administered in combination with additional antibodies or chemotherapeutic drugs or radiation therapy.

According to another aspect there is provided a method of treating cancer in a mammal by administering a therapeutically effective amount of an antagonist of the biological activity of uPAR. The method may include selecting an animal in need of treatment for cancer, and administering to the animal a therapeutically effective dose of an antagonist which antagonises the biological activity of uPAR. The antagonist can be administered alone, or can be administered in combination with additional antibodies or chemotherapeutic drugs or radiation therapy.

According to another aspect there is provided a method of treating cancer in a mammal by administering a therapeutically effective amount of a targeted binding agent which antagonizes the biological activity of uPAR. The method may include selecting an animal in need of treatment for cancer, and administering to the animal a therapeutically effective dose of a targeted binding agent which antagonises the biological activity of uPAR. The targeted binding agent can be administered alone, or can be administered in combination with additional antibodies or chemotherapeutic drugs or radiation therapy.

According to another aspect there is provided a method of treating cancer in a mammal by administering a therapeutically effective amount of an antibody which antagonizes the biological activity of uPAR. The method may include selecting an animal in need of treatment for cancer, and administering to the animal a therapeutically effective dose of an antibody which antagonises the biological activity of uPAR. The antibody can be administered alone, or can be administered in combination with additional antibodies or chemotherapeutic drugs or radiation therapy.

According to another aspect of the invention there is provided the use of an antagonist of the biological activity of uPAR for the manufacture of a medicament for the treatment of disease-related cell adhesion and/or invasion.

According to another aspect of the invention there is provided the use of a targeted binding agent which antagonizes the biological activity of uPAR for the manufacture of a medicament for the treatment of disease-related cell adhesion and/or invasion.

According to another aspect of the invention there is provided the use of an antibody which antagonizes the biological activity of uPAR for the manufacture of a medicament for the treatment of disease-related cell adhesion and/or invasion.

In one embodiment the present invention is particularly suitable for use in antagonizing uPAR, in patients with a tumor which is dependent alone, or in part, on a uPAR receptor.

Another embodiment of the invention includes an assay kit for detecting uPAR in mammalian tissues, cells, or body fluids to screen for cell adhesion- and invasion-related diseases. The kit includes a targeted binding agent that binds to uPAR and a means for indicating the reaction of the targeted binding agent with uPAR, if present. In one embodiment, the targeted binding agent that binds uPAR is labeled. In another embodiment the targeted binding agent is an unlabeled and the kit further includes a means for detecting the targeted binding agent. Preferably the targeted binding agent is labeled with a marker selected from the group consisting of a fluorochrome, an enzyme, a radionuclide and a radio-opaque material.

Another embodiment of the invention includes an assay kit for detecting uPAR in mammalian tissues, cells, or body fluids to screen for cell adhesion- and invasion-related diseases. The kit includes an antibody that binds to uPAR and a means for indicating the reaction of the antibody with uPAR, if present. The antibody may be a monoclonal antibody. In one embodiment, the antibody that binds uPAR is labeled. In another embodiment the antibody is an unlabeled primary antibody and the kit further includes a means for detecting the primary antibody. In one embodiment, the means includes a labeled second antibody that is an anti-immunoglobulin. Preferably the antibody is labeled with a marker selected from the group consisting of a fluorochrome, an enzyme, a radionuclide and a radio-opaque material.

Further embodiments, features, and the like regarding anti-uPAR antibodies are provided in additional detail below.

Sequence Listing

Embodiments of the invention include the specific anti-uPAR antibodies listed below in Table 1. This table reports the identification number of each anti-uPAR antibody, along with the SEQ ID number of the variable domain of the corresponding heavy chain and light chain genes. Each antibody has been given an identification number that includes three numbers separated by two decimal points.

TABLE 1 mAb SEQ ID ID No.: Sequence NO: 1.4.2 Nucleotide sequence encoding the variable region of the heavy chain 1 Amino acid sequence encoding the variable region of the heavy chain 2 Nucleotide sequence encoding the variable region of the light chain 3 Amino acid sequence encoding the variable region of the light chain 4 1.41.1 Nucleotide sequence encoding the variable region of the heavy chain 5 Amino acid sequence encoding the variable region of the heavy chain 6 Nucleotide sequence encoding the variable region of the light chain 7 Amino acid sequence encoding the variable region of the light chain 8 1.61.1 Nucleotide sequence encoding the variable region of the heavy chain 9 Amino acid sequence encoding the variable region of the heavy chain 10 Nucleotide sequence encoding the variable region of the light chain 11 Amino acid sequence encoding the variable region of the light chain 12 1.99.1 Nucleotide sequence encoding the variable region of the heavy chain 13 Amino acid sequence encoding the variable region of the heavy chain 14 Nucleotide sequence encoding the variable region of the light chain 15 Amino acid sequence encoding the variable region of the light chain 16 1.100.1 Nucleotide sequence encoding the variable region of the heavy chain 17 Amino acid sequence encoding the variable region of the heavy chain 18 Nucleotide sequence encoding the variable region of the light chain 19 Amino acid sequence encoding the variable region of the light chain 20 1.113.2 Nucleotide sequence encoding the variable region of the heavy chain 21 Amino acid sequence encoding the variable region of the heavy chain 22 Nucleotide sequence encoding the variable region of the light chain 23 Amino acid sequence encoding the variable region of the light chain 24 2.6.1 Nucleotide sequence encoding the variable region of the heavy chain 25 Amino acid sequence encoding the variable region of the heavy chain 26 Nucleotide sequence encoding the variable region of the light chain 27 Amino acid sequence encoding the variable region of the light chain 28 2.19.2 Nucleotide sequence encoding the variable region of the heavy chain 29 Amino acid sequence encoding the variable region of the heavy chain 30 Nucleotide sequence encoding the variable region of the light chain 31 Amino acid sequence encoding the variable region of the light chain 32 3.83 Nucleotide sequence encoding the variable region of the heavy chain 33 Amino acid sequence encoding the variable region of the heavy chain 34 Nucleotide sequence encoding the variable region of the light chain 35 Amino acid sequence encoding the variable region of the light chain 36 3.176.2 Nucleotide sequence encoding the variable region of the heavy chain 37 Amino acid sequence encoding the variable region of the heavy chain 38 Nucleotide sequence encoding the variable region of the light chain 39 Amino acid sequence encoding the variable region of the light chain 40 4.12.1 Nucleotide sequence encoding the variable region of the heavy chain 41 Amino acid sequence encoding the variable region of the heavy chain 42 Nucleotide sequence encoding the variable region of the light chain 43 Amino acid sequence encoding the variable region of the light chain 44 4.13.1 Nucleotide sequence encoding the variable region of the heavy chain 45 Amino acid sequence encoding the variable region of the heavy chain 46 Nucleotide sequence encoding the variable region of the light chain 47 Amino acid sequence encoding the variable region of the light chain 48 4.18.1 Nucleotide sequence encoding the variable region of the heavy chain 49 Amino acid sequence encoding the variable region of the heavy chain 50 Nucleotide sequence encoding the variable region of the light chain 51 Amino acid sequence encoding the variable region of the light chain 52 4.19.1 Nucleotide sequence encoding the variable region of the heavy chain 53 Amino acid sequence encoding the variable region of the heavy chain 54 Nucleotide sequence encoding the variable region of the light chain 55 Amino acid sequence encoding the variable region of the light chain 56 4.50.1 Nucleotide sequence encoding the variable region of the heavy chain 57 Amino acid sequence encoding the variable region of the heavy chain 58 Nucleotide sequence encoding the variable region of the light chain 59 Amino acid sequence encoding the variable region of the light chain 60

DEFINITIONS

Unless otherwise defined, scientific and technical terms used herein shall have the meanings that are commonly understood by those of ordinary skill in the art. Further, unless otherwise required by context, singular terms shall include pluralities and plural terms shall include the singular. Generally, nomenclatures utilized in connection with, and techniques of, cell and tissue culture, molecular biology, and protein and oligo- or polynucleotide chemistry and hybridization described herein are those well known and commonly used in the art.

Standard techniques are used for recombinant DNA, oligonucleotide synthesis, and tissue culture and transformation (e.g., electroporation, lipofection). Enzymatic reactions and purification techniques are performed according to manufacturer's specifications or as commonly accomplished in the art or as described herein. The foregoing techniques and procedures are generally performed according to conventional methods well known in the art and as described in various general and more specific references that are cited and discussed throughout the present specification. See e.g., Sambrook et al. Molecular Cloning: A Laboratory Manual (3rd ed., Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y. (2001)), which is incorporated herein by reference. The nomenclatures utilized in connection with, and the laboratory procedures and techniques of, analytical chemistry, synthetic organic chemistry, and medicinal and pharmaceutical chemistry described herein are those well known and commonly used in the art. Standard techniques are used for chemical syntheses, chemical analyses, pharmaceutical preparation, formulation, and delivery, and treatment of patients.

As utilized in accordance with the present disclosure, the following terms, unless otherwise indicated, shall be understood to have the following meanings:

An antagonist may be a polypeptide, nucleic acid, carbohydrate, lipid, small molecular weight compound, an oligonucleotide, an oligopeptide, RNA interference (RNAi), antisense, a recombinant protein, an antibody, or fragments thereof or conjugates or fusion proteins thereof. For a review of RNAi see Milhavet O, Gary D S, Mattson M P. (Pharmacol Rev. 2003 December; 55(4); 629-48. Review.) and antisense see Opalinska J B, Gewirtz A M. (Sci STKE. 2003 Oct. 28; 2003(206):pe 47.)

Disease-related cell adhesion and/or invasion may be any abnormal, undesirable or pathological cell adhesion and/or invasion, for example tumor-related cell adhesion and/or invasion. Cell adhesion- and/or invasion-related diseases include, but are not limited to, non-solid tumors such as leukemia, multiple myeloma or lymphoma, and also solid tumors such as melanoma, small cell lung cancer, non-small cell lung cancer, glioma, hepatocellular (liver) carcinoma, glioblastoma, carcinoma of the thyroid, bile duct, bone, gastric, brain/CNS, head and neck, hepatic system, stomach, prostate, breast, renal, testicle, ovary, skin, cervix, lung, muscle, neuron, oesophageal, bladder, lung, uterus, vulva, endometrium, kidney, colorectum, pancreas, pleural/peritoneal membranes, salivary gland, and epidermis.

A compound refers to any small molecular weight compound with a molecular weight of less than about 2000 Daltons.

The term “uPAR” refers to the molecule urokinase-type plasminogen activator receptor.

The term “neutralizing” when referring to an targeted binding agent such as an antibody relates to the ability of an antibody to eliminate, or significantly reduce, the activity of a target antigen. Accordingly, a “neutralizing” anti-uPAR antibody of the invention is capable of eliminating or significantly reducing the activity of uPAR. A neutralizing uPAR antibody may, for example, act by blocking the binding of uPA to its receptor uPAR. By blocking this binding, the uPA mediated plasminogen activation is significantly, or completely, eliminated. Ideally, a neutralizing antibody against uPAR inhibits cell adhesion and/or invasion.

The term “polypeptide” is used herein as a generic term to refer to native protein, fragments, or analogs of a polypeptide sequence. Hence, native protein, fragments, and analogs are species of the polypeptide genus. Preferred polypeptides in accordance with the invention comprise the human heavy chain immunoglobulin molecules and the human kappa light chain immunoglobulin molecules, as well as antibody molecules formed by combinations comprising the heavy chain immunoglobulin molecules with light chain immunoglobulin molecules, such as the kappa or lambda light chain immunoglobulin molecules, and vice versa, as well as fragments and analogs thereof. Preferred polypeptides in accordance with the invention may also comprise solely the human heavy chain immunoglobulin molecules or fragments thereof.

The term “naturally-occurring” as used herein as applied to an object refers to the fact that an object can be found in nature. For example, a polypeptide or polynucleotide sequence that is present in an organism (including viruses) that can be isolated from a source in nature and which has not been intentionally modified by man in the laboratory or otherwise is naturally-occurring.

The term “operably linked” as used herein refers to positions of components so described that are in a relationship permitting them to function in their intended manner. For example, a control sequence “operably linked” to a coding sequence is connected in such a way that expression of the coding sequence is achieved under conditions compatible with the control sequences.

The term “polynucleotide” as referred to herein means a polymeric form of nucleotides of at least 10 bases in length, either ribonucleotides or deoxynucleotides or a modified form of either type of nucleotide, or RNA-DNA hetero-duplexes. The term includes single and double stranded forms of DNA.

The term “oligonucleotide” referred to herein includes naturally occurring, and modified nucleotides linked together by naturally occurring, and non-naturally occurring linkages. Oligonucleotides are a polynucleotide subset generally comprising a length of 200 bases or fewer. Preferably, oligonucleotides are 10 to 60 bases in length and most preferably 12, 13, 14, 15, 16, 17, 18, 19, or 20 to 40 bases in length. Oligonucleotides are usually single stranded, e.g. for probes; although oligonucleotides may be double stranded, e.g. for use in the construction of a gene mutant. Oligonucleotides can be either sense or antisense oligonucleotides.

The term “naturally occurring nucleotides” referred to herein includes deoxyribonucleotides and ribonucleotides. The term “modified nucleotides” referred to herein includes nucleotides with modified or substituted sugar groups and the like. The term “oligonucleotide linkages” referred to herein includes oligonucleotides linkages such as phosphorothioate, phosphorodithioate, phosphoroselenoate, phosphorodiselenoate, phosphoroanilothioate, phosphoranilidate, phosphoroamidate, and the like. See e.g., LaPlanche et al. Nucl. Acids Res. 14:9081 (1986); Stec et al. J. Am. Chem. Soc. 106:6077 (1984); Stein et al. Nucl. Acids Res. 16:3209 (1988); Zon et al. Anti-Cancer Drug Design 6:539 (1991); Zon et al. Oligonucleotides and Analogues: A Practical Approach, pp. 87-108 (F. Eckstein, Ed., Oxford University Press, Oxford England (1991)); Stec et al. U.S. Pat. No. 5,151,510; Uhlmann and Peyman Chemical Reviews 90:543 (1990), the disclosures of which are hereby incorporated by reference. An oligonucleotide can include a label for detection, if desired.

Two amino acid sequences are “homologous” if there is a partial or complete identity between their sequences. For example, 85% homology means that 85% of the amino acids are identical when the two sequences are aligned for maximum matching. Gaps (in either of the two sequences being matched) are allowed in maximizing matching; gap lengths of 5 or less are preferred with 2 or less being more preferred. Alternatively and preferably, two protein sequences (or polypeptide sequences derived from them of at least about 30 amino acids in length) are homologous, as this term is used herein, if they have an alignment score of at more than 5 (in standard deviation units) using the program ALIGN with the mutation data matrix and a gap penalty of 6 or greater. See Dayhoff, M. O., in Atlas of Protein Sequence and Structure, pp. 101-110 (Volume 5, National Biomedical Research Foundation (1972)) and Supplement 2 to this volume, pp. 1-10. The two sequences or parts thereof are more preferably homologous if their amino acids are greater than or equal to 50% identical when optimally aligned using the ALIGN program. It should be appreciated that there can be differing regions of homology within two orthologous sequences. For example, the functional sites of mouse and human orthologues may have a higher degree of homology than non-functional regions.

The term “corresponds to” is used herein to mean that a polynucleotide sequence is homologous (i.e., is identical, not strictly evolutionarily related) to all or a portion of a reference polynucleotide sequence, or that a polypeptide sequence is identical to a reference polypeptide sequence.

In contradistinction, the term “complementary to” is used herein to mean that the complementary sequence is homologous to all or a portion of a reference polynucleotide sequence. For illustration, the nucleotide sequence “TATAC” corresponds to a reference sequence “TATAC” and is complementary to a reference sequence “GTATA”.

The term “sequence identity” means that two polynucleotide or amino acid sequences are identical (i.e., on a nucleotide-by-nucleotide or residue-by-residue basis) over the comparison window. The term “percentage of sequence identity” is calculated by comparing two optimally aligned sequences over the window of comparison, determining the number of positions at which the identical nucleic acid base (e.g., A, T, C, G, U, or I) or amino acid residue occurs in both sequences to yield the number of matched positions, dividing the number of matched positions by the total number of positions in the comparison window (i.e., the window size), and multiplying the result by 100 to yield the percentage of sequence identity. The terms “substantial identity” as used herein denotes a characteristic of a polynucleotide or amino acid sequence, wherein the polynucleotide or amino acid comprises a sequence that has at least 85 percent sequence identity, preferably at least 90 to 95 percent sequence identity, more preferably at least 99 percent sequence identity, as compared to a reference sequence over a comparison window of at least 18 nucleotide (6 amino acid) positions, frequently over a window of at least 24-48 nucleotide (8-16 amino acid) positions, wherein the percentage of sequence identity is calculated by comparing the reference sequence to the sequence which may include deletions or additions which total 20 percent or less of the reference sequence over the comparison window. The reference sequence may be a subset of a larger sequence.

As used herein, the twenty conventional amino acids and their abbreviations follow conventional usage. See Immunology—A Synthesis (2^(nd) Edition, E. S. Golub and D. R. Gren, Eds., Sinauer Associates, Sunderland, Mass. (1991)), which is incorporated herein by reference. Stereoisomers (e.g., D-amino acids) of the twenty conventional amino acids, unnatural amino acids such as α-, α-disubstituted amino acids, N-alkyl amino acids, lactic acid, and other unconventional amino acids may also be suitable components for polypeptides of the present invention. Examples of unconventional amino acids include: 4-hydroxyproline, γ-carboxyglutamate, ε-N,N,N-trimethyllysine, ε-N-acetyllysine, O-phosphoserine, N-acetylserine, N-formylmethionine, 3-methylhistidine, 5-hydroxylysine, σ-N-methylarginine, and other similar amino acids and imino acids (e.g., 4-hydroxyproline). In the polypeptide notation used herein, the left-hand direction is the amino terminal direction and the right-hand direction is the carboxy-terminal direction, in accordance with standard usage and convention.

Similarly, unless specified otherwise, the left-hand end of single-stranded polynucleotide sequences is the 5′ end; the left-hand direction of double-stranded polynucleotide sequences is referred to as the 5′ direction. The direction of 5′ to 3′ addition of nascent RNA transcripts is referred to as the transcription direction; sequence regions on the DNA strand having the same sequence as the RNA and which are 5′ to the 5′ end of the RNA transcript are referred to as “upstream sequences”; sequence regions on the DNA strand having the same sequence as the RNA and which are 3′ to the 3′ end of the RNA transcript are referred to as “downstream sequences”.

As applied to polypeptides, the term “substantial identity” means that two peptide sequences, when optimally aligned, such as by the programs GAP or BESTFIT using default gap weights, share at least 80 percent sequence identity, preferably at least 90 percent sequence identity, more preferably at least 95 percent sequence identity, and most preferably at least 99 percent sequence identity. Preferably, residue positions that are not identical differ by conservative amino acid substitutions. Conservative amino acid substitutions refer to the interchangeability of residues having similar side chains. For example, a group of amino acids having aliphatic side chains is glycine, alanine, valine, leucine, and isoleucine; a group of amino acids having aliphatic-hydroxyl side chains is serine and threonine; a group of amino acids having amide-containing side chains is asparagine and glutamine; a group of amino acids having aromatic side chains is phenylalanine, tyrosine, and tryptophan; a group of amino acids having basic side chains is lysine, arginine, and histidine; and a group of amino acids having sulfur-containing side chains is cysteine and methionine. Preferred conservative amino acids substitution groups are: valine-leucine-isoleucine, phenylalanine-tyrosine, lysine-arginine, alanine-valine, glutamic-aspartic, and asparagine-glutamine.

As discussed herein, minor variations in the amino acid sequences of antibodies or immunoglobulin molecules are contemplated as being encompassed by the present invention, providing that the variations in the amino acid sequence maintain at least 75%, more preferably at least 80%, 90%, 95%, and most preferably 99% sequence identity to the antibodies or immunoglobulin molecules described herein. In particular, conservative amino acid replacements are contemplated. Conservative replacements are those that take place within a family of amino acids that have related side chains. Genetically encoded amino acids are generally divided into families: (1) acidic=aspartate, glutamate; (2) basic=lysine, arginine, histidine; (3) non-polar=alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine, tryptophan; and (4) uncharged polar=glycine, asparagine, glutamine, cysteine, serine, threonine, tyrosine. More preferred families are: serine and threonine are an aliphatic-hydroxy family; asparagine and glutamine are an amide-containing family; alanine, valine, leucine and isoleucine are an aliphatic family; and phenylalanine, tryptophan, and tyrosine are an aromatic family. For example, it is reasonable to expect that an isolated replacement of a leucine with an isoleucine or valine, an aspartate with a glutamate, a threonine with a serine, or a similar replacement of an amino acid with a structurally related amino acid will not have a major effect on the binding function or properties of the resulting molecule, especially if the replacement does not involve an amino acid within a framework site. Whether an amino acid change results in a functional peptide can readily be determined by assaying the specific activity of the polypeptide derivative. Assays are described in detail herein. Fragments or analogs of antibodies or immunoglobulin molecules can be readily prepared by those of ordinary skill in the art. Preferred amino- and carboxy-termini of fragments or analogs occur near boundaries of functional domains. Structural and functional domains can be identified by comparison of the nucleotide and/or amino acid sequence data to public or proprietary sequence databases. Preferably, computerized comparison methods are used to identify sequence motifs or predicted protein conformation domains that occur in other proteins of known structure and/or function. Methods to identify protein sequences that fold into a known three-dimensional structure are known. Bowie et al. Science 253:164 (1991). Thus, the foregoing examples demonstrate that those of skill in the art can recognize sequence motifs and structural conformations that may be used to define structural and functional domains in accordance with the antibodies described herein.

Preferred amino acid substitutions are those which: (1) reduce susceptibility to proteolysis, (2) reduce susceptibility to oxidation, (3) alter binding affinity for forming protein complexes, (4) alter binding affinities, and (4) confer or modify other physicochemical or functional properties of such analogs. Analogs can include various muteins of a sequence other than the naturally-occurring peptide sequence. For example, single or multiple amino acid substitutions (preferably conservative amino acid substitutions) may be made in the naturally-occurring sequence (preferably in the portion of the polypeptide outside the domain(s) forming intermolecular contacts. A conservative amino acid substitution should not substantially change the structural characteristics of the parent sequence (e.g., a replacement amino acid should not tend to break a helix that occurs in the parent sequence, or disrupt other types of secondary structure that characterizes the parent sequence). Examples of art-recognized polypeptide secondary and tertiary structures are described in Proteins, Structures and Molecular Principles (Creighton, Ed., W. H. Freeman and Company, New York (1984)); Introduction to Protein Structure (C. Branden and J. Tooze, eds., Garland Publishing, New York, N.Y. (1991)); and Thornton et at. Nature 354:105 (1991), which are each incorporated herein by reference.

The term “polypeptide fragment” as used herein refers to a polypeptide that has an amino-terminal and/or carboxy-terminal deletion, but where the remaining amino acid sequence is identical to the corresponding positions in the naturally-occurring sequence deduced, for example, from a full-length cDNA sequence. Fragments typically are at least 5, 6, 8 or 10 amino acids long, preferably at least 14 amino acids long, more preferably at least 20 amino acids long, usually at least 50 amino acids long, and even more preferably at least 70 amino acids long. The term “analog” as used herein refers to polypeptides which are comprised of a segment of at least 25 amino acids that has substantial identity to a portion of a deduced amino acid sequence and which has at least one of the following properties: (1) specific binding to a uPAR, under suitable binding conditions, (2) ability to block appropriate uPA/uPAR binding, or (3) ability to inhibit uPA activity. Typically, polypeptide analogs comprise a conservative amino acid substitution (or addition or deletion) with respect to the naturally-occurring sequence. Analogs typically are at least 20 amino acids long, preferably at least 50 amino acids long or longer, and can often be as long as a full-length naturally-occurring polypeptide.

Peptide analogs are commonly used in the pharmaceutical industry as non-peptide drugs with properties analogous to those of the template peptide. These types of non-peptide compound are termed “peptide mimetics” or “peptidomimetics”. Fauchere, J. Adv. Drug Res. 15:29 (1986); Veber and Freidinger TINS p. 392 (1985); and Evans et al. J. Med. Chem. 30:1229 (1987), which are incorporated herein by reference. Such compounds are often developed with the aid of computerized molecular modeling. Peptide mimetics that are structurally similar to therapeutically useful peptides may be used to produce an equivalent therapeutic or prophylactic effect. Generally, peptidomimetics are structurally similar to a paradigm polypeptide (i.e., a polypeptide that has a biochemical property or pharmacological activity), such as human antibody, but have one or more peptide linkages optionally replaced by a linkage selected from the group consisting of: —CH₂NH—, —CH₂S—, —CH₂—CH₂—, —CH═CH-(cis and trans), —COCH₂—, —CH(OH)CH₂—, and —CH₂SO—, by methods well known in the art. Systematic substitution of one or more amino acids of a consensus sequence with a D-amino acid of the same type (e.g., D-lysine in place of L-lysine) may be used to generate more stable peptides. In addition, constrained peptides comprising a consensus sequence or a substantially identical consensus sequence variation may be generated by methods known in the art (Rizo and Gierasch Ann. Rev. Biochem. 61:387 (1992), incorporated herein by reference); for example, by adding internal cysteine residues capable of forming intramolecular disulfide bridges which cyclize the peptide.

As used herein, the term “antibody” refers to a polypeptide or group of polypeptides that are comprised of at least one binding domain that is formed from the folding of polypeptide chains having three-dimensional binding spaces with internal surface shapes and charge distributions complementary to the features of an antigenic determinant of an antigen. An antibody typically has a tetrameric form, comprising two identical pairs of polypeptide chains, each pair having one “light” and one “heavy” chain. The variable regions of each light/heavy chain pair form an antibody binding site.

As used herein, targeted binding agent, targeted binding protein, specific binding protein and like terms refer to an antibody, or binding fragment thereof, that preferentially binds to a target site. In one embodiment, the targeted binding agent is specific for only one target site. In other embodiments, the targeted binding agent is specific for more than one target site. In one embodiment, the targeted binding agent may be a monoclonal antibody and the target site may be an epitope.

“Binding fragments” of an antibody are produced by recombinant DNA techniques, or by enzymatic or chemical cleavage of intact antibodies. Binding fragments include Fab, Fab′, F(ab′)₂, Fv, Dab and single-chain antibodies. An antibody other than a “bispecific” or “bifunctional” antibody is understood to have each of its binding sites identical. An antibody substantially inhibits adhesion of a receptor to a counter-receptor when an excess of antibody reduces the quantity of receptor bound to counter-receptor by at least about 20%, 40%, 60% or 80%, and more usually greater than about 85% (as measured in an in vitro competitive binding assay).

An antibody may be oligoclonal, a polyclonal antibody, a monoclonal antibody, a chimeric antibody, a CDR-grafted antibody, a multi-specific antibody, a bi-specific antibody, a catalytic antibody, a chimeric antibody, a humanized antibody, a fully human antibody, an anti-idiotypic antibody and antibodies that can be labeled in soluble or bound form as well as fragments, variants or derivatives thereof, either alone or in combination with other amino acid sequences provided by known techniques. An antibody may be from any species. The term antibody also includes binding fragments of the antibodies of the invention; exemplary fragments include Fv, Fab, Fab′, single stranded antibody (svFC), dimeric variable region (Diabody) and disulphide stabilized variable region (dsFv).

The term “epitope” includes any protein determinant capable of specific binding to an immunoglobulin or T-cell receptor. Epitopic determinants usually consist of chemically active surface groupings of molecules such as amino acids or sugar side chains and may, but not always, have specific three-dimensional structural characteristics, as well as specific charge characteristics. An antibody is said to specifically bind an antigen when the dissociation constant is ≦1 μM, preferably ≦100 nM and most preferably ≦10 nM.

The term “agent” is used herein to denote a chemical compound, a mixture of chemical compounds, a biological macromolecule, or an extract made from biological materials.

“Active” or “activity” in regard to a uPAR polypeptide refers to a portion of an uPAR polypeptide that has a biological or an immunological activity of a native uPAR polypeptide. “Biological” when used herein refers to a biological function that results from the activity of the native uPAR polypeptide. A preferred uPAR biological activity includes, for example, uPAR induced cell adhesion and invasion.

“Mammal” when used herein refers to any animal that is considered a mammal. Preferably, the mammal is human.

Digestion of antibodies with the enzyme, papain, results in two identical antigen-binding fragments, known also as “Fab” fragments, and a “Fc” fragment, having no antigen-binding activity but having the ability to crystallize. Digestion of antibodies with the enzyme, pepsin, results in the a F(ab′)₂ fragment in which the two arms of the antibody molecule remain linked and comprise two-antigen binding sites. The F(ab′)₂ fragment has the ability to crosslink antigen.

“Fv” when used herein refers to the minimum fragment of an antibody that retains both antigen-recognition and antigen-binding sites.

“Fab” when used herein refers to a fragment of an antibody that comprises the constant domain of the light chain and the CH1 domain of the heavy chain.

“Dab” when used herein refers to a fragment of an antibody that is the smallest functional binding unit of a human antibodies.

The term “mAb” refers to monoclonal antibody.

“Liposome” when used herein refers to a small vesicle that may be useful for delivery of drugs that may include the uPAR polypeptide of the invention or antibodies to such an uPAR polypeptide to a mammal.

“Label” or “labeled” as used herein refers to the addition of a detectable moiety to a polypeptide, for example, a radiolabel, fluorescent label, enzymatic label chemiluminescent labeled or a biotinyl group. Radioisotopes or radionuclides may include ³H, ¹⁴C, ¹⁵N, ³⁵S, ⁹⁰Y, ⁹⁹Tc, ¹²⁵I, ¹³¹I, fluorescent labels may include rhodamine, lanthanide phosphors or FITC and enzymatic labels may include horseradish peroxidase, β-galactosidase, luciferase, alkaline phosphatase.

The term “pharmaceutical agent or drug” as used herein refers to a chemical compound or composition capable of inducing a desired therapeutic effect when properly administered to a patient. Other chemistry terms herein are used according to conventional usage in the art, as exemplified by The McGraw-Hill Dictionary of Chemical Terms (Parker, S., Ed., McGraw-Hill, San Francisco (1985)), (incorporated herein by reference).

As used herein, “substantially pure” means an object species is the predominant species present (i.e., on a molar basis it is more abundant than any other individual species in the composition), and preferably a substantially purified fraction is a composition wherein the object species comprises at least about 50 percent (on a molar basis) of all macromolecular species present. Generally, a substantially pure composition will comprise more than about 80 percent of all macromolecular species present in the composition, more preferably more than about 85%, 90%, 95%, and 99%. Most preferably, the object species is purified to essential homogeneity (contaminant species cannot be detected in the composition by conventional detection methods) wherein the composition consists essentially of a single macromolecular species.

The term “patient” includes human and veterinary subjects.

Human Antibodies and Humanization of Antibodies

Human antibodies avoid some of the problems associated with antibodies that possess murine or rat variable and/or constant regions. The presence of such murine or rat derived proteins can lead to the rapid clearance of the antibodies or can lead to the generation of an immune response against the antibody by a patient. In order to avoid the utilization of murine or rat derived antibodies, fully human antibodies can be generated through the introduction of functional human antibody loci into a rodent, other mammal or animal so that the rodent, other mammal or animal produces fully human antibodies.

One method for generating fully human antibodies is through the use of XenoMouse® strains of mice that have been engineered to contain up to but less than 1000 kb-sized germline configured fragments of the human heavy chain locus and kappa light chain locus. See Mendez et al. Nature Genetics 15:146-156 (1997) and Green and Jakobovits J. Exp. Med. 188:483-495 (1998). The XenoMouse® strains are available from Abgenix, Inc. (Fremont, Calif.).

The production of the XenoMouse® strains of mice is further discussed and delineated in U.S. patent application Ser. No. 07/466,008, filed Jan. 12, 1990, Ser. No. 07/610,515, filed Nov. 8, 1990, Ser. No. 07/919,297, filed Jul. 24, 1992, Ser. No. 07/922,649, filed Jul. 30, 1992, Ser. No. 08/031,801, filed Mar. 15, 1993, Ser. No. 08/112,848, filed Aug. 27, 1993, Ser. No. 08/234,145, filed Apr. 28, 1994, Ser. No. 08/376,279, filed Jan. 20, 1995, Ser. No. 08/430,938, filed Apr. 27, 1995, Ser. No. 08/464,584, filed Jun. 5, 1995, Ser. No. 08/464,582, filed Jun. 5, 1995, Ser. No. 08/463,191, filed Jun. 5, 1995, Ser. No. 08/462,837, filed Jun. 5, 1995, Ser. No. 08/486,853, filed Jun. 5, 1995, Ser. No. 08/486,857, filed Jun. 5, 1995, Ser. No. 08/486,859, filed Jun. 5, 1995, Ser. No. 08/462,513, filed Jun. 5, 1995, Ser. No. 08/724,752, filed Oct. 2, 1996, Ser. No. 08/759,620, filed Dec. 3, 1996, U.S. Publication 2003/0093820, filed Nov. 30, 2001 and U.S. Pat. Nos. 6,162,963, 6,150,584, 6,114,598, 6,075,181, and 5,939,598 and Japanese Patent Nos. 3 068 180 B2, 3 068 506 B2, and 3 068 507 B2. See also European Patent No., EP 0 463 151 B1, grant published Jun. 12, 1996, International Patent Application No., WO 94/02602, published Feb. 3, 1994, International Patent Application No., WO 96/34096, published Oct. 31, 1996, WO 98/24893, published Jun. 11, 1998, WO 00/76310, published Dec. 21, 2000. The disclosures of each of the above-cited patents, applications, and references are hereby incorporated by reference in their entirety.

In an alternative approach, others, including GenPharm International, Inc., have utilized a “minilocus” approach. In the minilocus approach, an exogenous Ig locus is mimicked through the inclusion of pieces (individual genes) from the Ig locus. Thus, one or more V_(H) genes, one or more D_(H) genes, one or more J_(H) genes, a mu constant region, and usually a second constant region (preferably a gamma constant region) are formed into a construct for insertion into an animal. This approach is described in U.S. Pat. No. 5,545,807 to Surani et al. and U.S. Pat. Nos. 5,545,806, 5,625,825, 5,625,126, 5,633,425, 5,661,016, 5,770,429, 5,789,650, 5,814,318, 5,877,397, 5,874,299, and 6,255,458 each to Lonberg and Kay, U.S. Pat. Nos. 5,591,669 and 6,023.010 to Krimpenfort and Berns, U.S. Pat. Nos. 5,612,205, 5,721,367, and 5,789,215 to Berns et al., and U.S. Pat. No. 5,643,763 to Choi and Dunn, and GenPharm International U.S. patent application Ser. No. 07/574,748, filed Aug. 29, 1990, Ser. No. 07/575,962, filed Aug. 31, 1990, Ser. No. 07/810,279, filed Dec. 17, 1991, Ser. No. 07/853,408, filed Mar. 18, 1992, Ser. No. 07/904,068, filed Jun. 23, 1992, Ser. No. 07/990,860, filed Dec. 16, 1992, Ser. No. 08/053,131, filed Apr. 26, 1993, Ser. No. 08/096,762, filed Jul. 22, 1993, Ser. No. 08/155,301, filed Nov. 18, 1993, Ser. No. 08/161,739, filed Dec. 3, 1993, Ser. No. 08/165,699, filed Dec. 10, 1993, Ser. No. 08/209,741, filed Mar. 9, 1994, the disclosures of which are hereby incorporated by reference. See also European Patent No. 0 546 073 B1, International Patent Application Nos. WO 92/03918, WO 92/22645, WO 92/22647, WO 92/22670, WO 93/12227, WO 94/00569, WO 94/25585, WO 96/14436, WO 97/13852, and WO 98/24884 and U.S. Pat. No. 5,981,175, the disclosures of which are hereby incorporated by reference in their entirety. See further Taylor et al., 1992, Chen et al., 1993, Tuaillon et al., 1993, Choi et al., 1993, Lonberg et al., (1994), Taylor et al., (1994), and Tuaillon et al., (1995), Fishwild et al., (1996), the disclosures of which are hereby incorporated by reference in their entirety.

Kirin has also demonstrated the generation of human antibodies from mice in which, through microcell fusion, large pieces of chromosomes, or entire chromosomes, have been introduced. See European Patent Application Nos. 773 288 and 843 961, the disclosures of which are hereby incorporated by reference. Additionally, KM™-mice, which are the result of cross-breeding of Kirin's Tc mice with Medarex's minilocus (Humab) mice have been generated., These mice possess the human IgH transchromosome of the Kirin mice and the kappa chain transgene of the Genpharm mice (Ishida et al., Cloning Stem Cells, (2002) 4:91-102).

Human antibodies can also be derived by in vitro methods. Suitable examples include but are not limited to phage display (CAT, Morphosys, Dyax, Biosite/Medarex, Xoma, Symphogen, Alexion (formerly, Proliferon), Affimed) ribosome display (CAT), yeast display, and the like.

Preparation of Antibodies

Antibodies, as described herein, were prepared through the utilization of the XenoMouse® technology, as described below. Such mice, then, are capable of producing human immunoglobulin molecules and antibodies and are deficient in the production of murine immunoglobulin molecules and antibodies. Technologies utilized for achieving the same are disclosed in the patents, applications, and references disclosed in the background section herein. In particular, however, a preferred embodiment of transgenic production of mice and antibodies therefrom is disclosed in U.S. patent application Ser. No. 08/759,620, filed Dec. 3, 1996 and International Patent Application Nos. WO 98/24893, published Jun. 11, 1998 and WO 00/76310, published Dec. 21, 2000, the disclosures of which are hereby incorporated by reference. See also Mendez et al. Nature Genetics 15:146-156 (1997), the disclosure of which is hereby incorporated by reference.

Through the use of such technology, fully human monoclonal antibodies to a variety of antigens have been produced. Essentially, XenoMouse® lines of mice are immunized with an antigen of interest (e.g. uPAR), lymphatic cells (such as B-cells) are recovered from the hyper-immunized mice, and the recovered lymphocytes are fused with a myeloid-type cell line to prepare immortal hybridoma cell lines. These hybridoma cell lines are screened and selected to identify hybridoma cell lines that produced antibodies specific to the antigen of interest. Provided herein are methods for the production of multiple hybridoma cell lines that produce antibodies specific to uPAR. Further, provided herein are characterization of the antibodies produced by such cell lines; including nucleotide and amino acid sequence analyses of the heavy and light chains of such antibodies.

Alternatively, instead of being fused to myeloma cells to generate hybridomas, B cells can be directly assayed. For example, CD19+ B-cells can be isolated from hyperimmune XenoMouse® mice and allowed to proliferate and differentiate into antibody-secreting plasma cells. Antibodies from the cell supernatants are then screened by ELISA for reactivity against the uPAR immunogen. The supernatants might also be screened for immunoreactivity against fragments of uPAR to further map the different antibodies for binding to domains of functional interest on uPAR. The antibodies may also be screened other related human receptors and against the rat, the mouse, and non-human primate, such as Cynomolgus monkey, orthologues of uPAR, the last to determine species cross-reactivity. B cells from wells containing, antibodies of interest may be immortalized by various methods including fusion to make hybridomas either from individual or from pooled wells, or by infection with EBV or transfection by known immortalizing genes and then plating in suitable medium. Alternatively, single plasma cells secreting antibodies with the desired specificities are then isolated using a uPAR-specific hemolytic plaque assay (see for example Babcook et al., Proc. Natl. Acad. Sci. USA 93:7843-48 (1996)). Cells targeted for lysis are preferably sheep red blood cells (SRBCs) coated with the uPAR antigen.

In the presence of a B-cell culture containing plasma cells secreting the immunoglobulin of interest and complement, the formation of a plaque indicates specific uPAR-mediated lysis of the sheep red blood cells surrounding the plasma cell of interest. The single antigen-specific plasma cell in the center of the plaque can be isolated and the genetic information that encodes the specificity of the antibody is isolated from the single plasma cell. Using reverse-transcription followed by PCR (RT-PCR), the DNA encoding the heavy and light chain variable regions of the antibody can be cloned. Such cloned DNA can then be further inserted into a suitable expression vector, preferably a vector cassette such as a pcDNA, more preferably such a pcDNA vector containing the constant domains of immunoglobulin heavy and light chain. The generated vector can then be transfected into host cells, e.g., HEK293 cells, CHO cells, and cultured in conventional nutrient media modified as appropriate for inducing transcription, selecting transformants, or amplifying the genes encoding the desired sequences.

In general, antibodies produced by the fused hybridomas were human IgG2 heavy chains with fully human kappa or lambda light chains. Antibodies described herein possess human IgG4 heavy chains as well as IgG2 heavy chains. Antibodies can also be of other human isotypes, including IgG1. The antibodies possessed high affinities, typically possessing a Kd of from about 10⁻⁶ through about 10⁻¹² M or below, when measured by solid phase and solution phase techniques. Antibodies possessing a KD of at least 10⁻¹¹ M are preferred to inhibit the activity of uPAR.

As will be appreciated, antibodies can be expressed in cell lines other than hybridoma cell lines. Sequences encoding particular antibodies can be used to transform a suitable mammalian host cell. Transformation can be by any known method for introducing polynucleotides into a host cell, including, for example packaging the polynucleotide in a virus (or into a viral vector) and transducing a host cell with the virus (or vector) or by transfection procedures known in the art, as exemplified by U.S. Pat. Nos. 4,399,216, 4,912,040, 4,740,461, and 4,959,455 (which patents are hereby incorporated herein by reference). The transformation procedure used depends upon the host to be transformed. Methods for introducing heterologous polynucleotides into mammalian cells are well known in the art and include dextran-mediated transfection, calcium phosphate precipitation, polybrene mediated transfection, protoplast fusion, electroporation, encapsulation of the polynucleotide(s) in liposomes, and direct microinjection of the DNA into nuclei.

Mammalian cell lines available as hosts for expression are well known in the art and include many immortalized cell lines available from the American Type Culture Collection (ATCC), including but not limited to Chinese hamster ovary (CHO) cells, HeLa cells, baby hamster kidney (BHK) cells, monkey kidney cells (COS), human hepatocellular carcinoma cells (e.g., Hep G2), human epithelial kidney 293 cells, and a number of other cell lines. Cell lines of particular preference are selected through determining which cell lines have high expression levels and produce antibodies with constitutive uPAR binding properties.

Based on the ability of mAbs to significantly neutralize uPAR activity (as demonstrated in the Examples below), these antibodies will have therapeutic effects in treating symptoms and conditions resulting from uPAR expression. In specific embodiments, the antibodies and methods herein relate to the treatment of symptoms resulting from uPAR induced cell adhesion, invasion and intracellular signalling.

According to another aspect of the invention there is provided a pharmaceutical composition comprising an antagonist of the biological activity of uPAR, and a pharmaceutically acceptable carrier. In one embodiment the antagonist comprises an antibody. According to another aspect of the invention there is provided a pharmaceutical composition comprising an antagonist of the biological activity of uPAR, and a pharmaceutically acceptable carrier. In one embodiment the antagonist comprises an antibody.

Anti-uPAR antibodies are useful in the detection of uPAR in patient samples and accordingly are useful as diagnostics for disease states as described herein. In addition, based on their ability to significantly inhibit uPA activity (as demonstrated in the Examples below), anti-uPAR antibodies have therapeutic effects in treating symptoms and conditions resulting from uPAR expression. In specific embodiments, the antibodies and methods herein relate to the treatment of symptoms resulting from uPAR induced cell adhesion, invasion and intracellular signalling. Further embodiments involve using the antibodies and methods described herein to treat cell adhesion- and invasion-related diseases including neoplastic diseases, such as, melanoma, small cell lung cancer, non-small cell lung cancer, glioma, hepatocellular (liver) carcinoma, thyroid tumor, gastric (stomach) cancer, prostate cancer, breast cancer, ovarian cancer, bladder cancer, lung cancer, glioblastoma, endometrial cancer, kidney cancer, colon cancer, and pancreatic cancer. The antibodies may also be useful in treating cell adhesion and/or invasion in arthritis, atherosclerosis and diseases involving angiogenesis.

Therapeutic Administration and Formulations

Embodiments of the invention include sterile pharmaceutical formulations of anti-uPAR antibodies that are useful as treatments for diseases. Such formulations would inhibit the binding of uPA to its receptor uPAR, thereby effectively treating pathological conditions where, for example, serum or tissue uPAR is abnormally elevated. Anti-uPAR antibodies preferably possess adequate affinity to potently inhibit uPA, and preferably have an adequate duration of action to allow for infrequent dosing in humans. A prolonged duration of action will allow for less frequent and more convenient dosing schedules by alternate parenteral routes such as subcutaneous or intramuscular injection.

Sterile formulations can be created, for example, by filtration through sterile filtration membranes, prior to or following lyophilization and reconstitution of the antibody. The antibody ordinarily will be stored in lyophilized form or in solution. Therapeutic antibody compositions generally are placed into a container having a sterile access port, for example, an intravenous solution bag or vial having an adapter that allows retrieval of the formulation, such as a stopper pierceable by a hypodermic injection needle.

The route of antibody administration is in accord with known methods, e.g., injection or infusion by intravenous, intraperitoneal, intracerebral, intramuscular, intraocular, intraarterial, intrathecal, inhalation or intralesional routes, direct injection to a tumor site, or by sustained release systems as noted below. The antibody is preferably administered continuously by infusion or by bolus injection.

An effective amount of antibody to be employed therapeutically will depend, for example, upon the therapeutic objectives, the route of administration, and the condition of the patient. Accordingly, it is preferred that the therapist titer the dosage and modify the route of administration as required to obtain the optimal therapeutic effect. Typically, the clinician will administer antibody until a dosage is reached that achieves the desired effect. The progress of this therapy is easily monitored by conventional assays or by the assays described herein.

Antibodies, as described herein, can be prepared in a mixture with a pharmaceutically acceptable carrier. This therapeutic composition can be administered intravenously or through the nose or lung, preferably as a liquid or powder aerosol (lyophilized). The composition may also be administered parenterally or subcutaneously as desired. When administered systemically, the therapeutic composition should be sterile, pyrogen-free and in a parenterally acceptable solution having due regard for pH, isotonicity, and stability. These conditions are known to those skilled in the art. Briefly, dosage formulations of the compounds described herein are prepared for storage or administration by mixing the compound having the desired degree of purity with pharmaceutically acceptable carriers, excipients, or stabilizers. Such materials are non-toxic to the recipients at the dosages and concentrations employed, and include buffers such as TRIS HCl, phosphate, citrate, acetate and other organic acid salts; antioxidants such as ascorbic acid; low molecular weight (less than about ten residues) peptides such as polyarginine; proteins, such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as polyvinylpyrrolidinone; amino acids such as glycine, glutamic acid, aspartic acid, or arginine; monosaccharides, disaccharides, and other carbohydrates including cellulose or its derivatives, glucose, mannose, or dextrins; chelating agents such as EDTA; sugar alcohols such as mannitol or sorbitol; counterions such as sodium and/or nonionic surfactants such as TWEEN, PLURONICS or polyethyleneglycol.

Sterile compositions for injection can be formulated according to conventional pharmaceutical practice as described in Remington: The Science and Practice of Pharmacy (20^(th) ed, Lippincott Williams & Wilkens Publishers (2003)). For example, dissolution or suspension of the active compound in a pharmaceutically acceptable carrier such as water or naturally occurring vegetable oil like sesame, peanut, or cottonseed oil or a synthetic fatty vehicle like ethyl oleate or the like may be desired. Buffers, preservatives, antioxidants and the like can be incorporated according to accepted pharmaceutical practice.

Suitable examples of sustained-release preparations include semipermeable matrices of solid hydrophobic polymers containing the polypeptide, which matrices are in the form of shaped articles, films or microcapsules. Examples of sustained-release matrices include polyesters, hydrogels (e.g., poly(2-hydroxyethyl-methacrylate) as described by Langer et al., J. Biomed Mater. Res., (1981) 15:167-277 and Langer, Chem. Tech., (1982) 12:98-105, or poly(vinylalcohol)), polylactides (U.S. Pat. No. 3,773,919, EP 58,481), copolymers of L-glutamic acid and gamma ethyl-L-glutamate (Sidman et al., Biopolymers, (1983) 22:547-556), non-degradable ethylene-vinyl acetate (Langer et al., supra), degradable lactic acid-glycolic acid copolymers such as the LUPRON Depot™ (injectable microspheres composed of lactic acid-glycolic acid copolymer and leuprolide acetate), and poly-D-(−)-3-hydroxybutyric acid (EP 133,988).

While polymers such as ethylene-vinyl acetate and lactic acid-glycolic acid enable release of molecules for over 100 days, certain hydrogels release proteins for shorter time periods. When encapsulated proteins remain in the body for a long time, they may denature or aggregate as a result of exposure to moisture at 37° C., resulting in a loss of biological activity and possible changes in immunogenicity. Rational strategies can be devised for protein stabilization depending on the mechanism involved. For example, if the aggregation mechanism is discovered to be intermolecular S—S bond formation through disulfide interchange, stabilization may be achieved by modifying sulfhydryl residues, lyophilizing from acidic solutions, controlling moisture content, using appropriate additives, and developing specific polymer matrix compositions.

Sustained-released compositions also include preparations of crystals of the antibody suspended in suitable formulations capable of maintaining crystals in suspension. These preparations when injected subcutaneously or intraperitonealy can produce a sustained release effect. Other compositions also include liposomally entrapped antibodies. Liposomes containing such antibodies are prepared by methods known per se: U.S. Pat. No. DE 3,218,121; Epstein et al., Proc. Natl. Acad. Sci. USA, (1985) 82:3688-3692; Hwang et al., Proc. Natl. Acad. Sci. USA, (1980) 77:4030-4034; EP 52,322; EP 36,676; EP 88,046; EP 143,949; 142,641; Japanese patent application 83-118008; U.S. Pat. Nos. 4,485,045 and 4,544,545; and EP 102,324.

The dosage of the antibody formulation for a given patient will be determined by the attending physician taking into consideration various factors known to modify the action of drugs including severity and type of disease, body weight, sex, diet, time and route of administration, other medications and other relevant clinical factors. Therapeutically effective dosages may be determined by either in vitro or in viva methods.

An effective amount of the antibodies, described herein, to be employed therapeutically will depend, for example, upon the therapeutic objectives, the route of administration, and the condition of the patient. Accordingly, it is preferred for the therapist to titer the dosage and modify the route of administration as required to obtain the optimal therapeutic effect. A typical daily dosage might range from about 0.001 mg/kg, 0.01 mg/kg, 0.1 mg/kg, 1 mg/kg, 10 mg/kg to up to 100 mg/kg, 1000 mg/kg, 10000 mg/kg or more, depending on the factors mentioned above. Typically, the clinician will administer the therapeutic antibody until a dosage is reached that achieves the desired effect. The progress of this therapy is easily monitored by conventional assays or as described herein.

It will be appreciated that administration of therapeutic entities in accordance with the compositions and methods herein will be administered with suitable carriers, excipients, and other agents that are incorporated into formulations to provide improved transfer, delivery, tolerance, and the like. These formulations include, for example, powders, pastes, ointments, jellies, waxes, oils, lipids, lipid (cationic or anionic) containing vesicles (such as Lipofectin™), DNA conjugates, anhydrous absorption pastes, oil-in-water and water-in-oil emulsions, emulsions carbowax (polyethylene glycols of various molecular weights), semi-solid gels, and semi-solid mixtures containing carbowax. Any of the foregoing mixtures may be appropriate in treatments and therapies in accordance with the present invention, provided that the active ingredient in the formulation is not inactivated by the formulation and the formulation is physiologically compatible and tolerable with the route of administration. See also Baldrick P. “Pharmaceutical excipient development: the need for preclinical guidance.” Regul. Toxicol. Pharmacol. 32(2):210-8 (2000), Wang W. “Lyophilization and development of solid protein pharmaceuticals.” Int. J. Pharm. 203(1-2):1-60 (2000), Charman W N “Lipids, lipophilic drugs, and oral drug delivery-some emerging concepts.” J Pharm Sci 89(8):967-78 (2000), Powell et al. “Compendium of excipients for parenteral formulations” PDA J Pharm Sci Technol. 52:238-311 (1998) and the citations therein for additional information related to formulations, excipients and carriers well known to pharmaceutical chemists.

Design and Generation of Other Therapeutics

In accordance with the present invention and based on the activity of the antibodies that are produced and characterized herein with respect to uPAR, the design of other therapeutic modalities beyond antibody moieties is facilitated. Such modalities include, without limitation, advanced antibody therapeutics, such as bispecific antibodies, immunotoxins, and radiolabeled therapeutics, single domain antibodies, antibody fragments, such as a Fab, Fab′, F(ab′)₂, Fv or Dab, generation of peptide therapeutics, uPAR binding domains in novel scaffolds, gene therapies, particularly intrabodies, antisense therapeutics, and small molecules.

In connection with the generation of advanced antibody therapeutics, where complement fixation is a desirable attribute, it may be possible to sidestep the dependence on complement for cell killing through the use of bispecific antibodies, immunotoxins, or radiolabels, for example.

Bispecific antibodies can be generated that comprise (i) two antibodies one with a specificity to uPAR and another to a second molecule that are conjugated together, (ii) a single antibody that has one chain specific to uPAR and a second chain specific to a second molecule, or (iii) a single chain antibody that has specificity to uPAR and the other molecule. Such bispecific antibodies can be generated using techniques that are well known; for example, in connection with (i) and (ii) see e.g., Fanger et al. Immunol Methods 4:72-81 (1994) and Wright and Harris, supra. and in connection with (iii) see e.g., Traunecker et al. Int. J. Cancer (Suppl.) 7:51-52 (1992). In each case, the second specificity can be made to the heavy chain activation receptors, including, without limitation, CD16 or CD64 (see e.g., Deo et al. Immunol. Today 18:127 (1997)) or CD89 (see e.g., Valerius et al. Blood 90:4485-4492 (1997)).

In connection with immunotoxins, antibodies can be modified to act as immunotoxins utilizing techniques that are well, known in the art. See e.g.; Vitetta Immunol Today 14:252 (1993). See also U.S. Pat. No. 5,194,594. In connection with the preparation of radiolabeled antibodies, such modified antibodies can also be readily prepared utilizing techniques that are well known in the art. See e.g., Junghans et al. in Cancer Chemotherapy and Biotherapy 655-686 (2d edition, Chafner and Longo, eds., Lippincott Raven (1996)). See also U.S. Pat. Nos. 4,681,581, 4,735,210, 5,101,827, 5,102,990 (RE 35,500), 5,648,471, and 5,697,902.

Combinations

The anti-tumor treatment defined herein may be applied as a sole therapy or may involve, in addition to the compounds of the invention, conventional surgery or radiotherapy or chemotherapy. Such chemotherapy may include one or more of the following categories of anti tumor agents:

-   -   (i) other antiproliferative/antineoplastic drugs and         combinations thereof, as used in medical oncology, such as         alkylating agents (for example cis-platin, oxaliplatin,         carboplatin, cyclophosphamide, nitrogen mustard, melphalan,         chlorambucil, busulphan, temozolamide and nitrosoureas);         antimetabolites (for example gemcitabine and antifolates such as         fluoropyrimidines like 5-fluorouracil and tegafur, raltitrexed,         methotrexate, cytosine arabinoside, and hydroxyurea); antitumor         antibiotics (for example anthracyclines like adriamycin,         bleomycin, doxorubicin, daunomycin, epirubicin, idarubicin,         mitomycin-C, dactinomycin and mithramycin); antimitotic agents         (for example vinca alkaloids like vincristine, vinblastine,         vindesine and vinorelbine and taxoids like taxol and taxotere         and polokinase inhibitors); and topoisomerase inhibitors (for         example epipodophyllotoxins like etoposide and teniposide,         amsacrine, topotecan and camptothecin);     -   (ii) cytostatic agents such as antioestrogens (for example         tamoxifen, fulvestrant, toremifene, raloxifene, droloxifene and         iodoxyfene), antiandrogens (for example bicalutamide, flutamide,         nilutamide and cyproterone acetate), LHRH antagonists or LHRH         agonists (for example goserelin, leuprorelin and buserelin),         progestogens (for example megestrol acetate), aromatase         inhibitors (for example as anastrozole, letrozole, vorazole and         exemestane) and inhibitors of 5α-reductase such as finasteride;     -   (iii) anti-invasion agents (for example c-Src kinase family         inhibitors like         4-(6-chloro-2,3-methylenedioxyanilino)-7-[2-(4-methylpiperazin-1-yl)ethoxy]-5-tetrahydropyran-4-yloxyquinazoline         (AZD0530; International Patent. Application WO 01/94341) and         N-(2-chloro-6-methylphenyl)-2-{6-[4-(2-hydroxyethyl)piperazin-1-yl]-2-methylpyrimidin-4-ylamino}thiazole-5-carboxamide         (dasatinib, BMS-354825; J. Med. Chem. 2004, 47, 6658-6661), and         metalloproteinase inhibitors like marimastat, other inhibitors         of urokinase plasminogen activator receptor function or,         inhibitors of cathepsins, inhibitors of serine proteases for         example matriptase, hepsin, urokinase, inhibitors of         heparanase);     -   (iv) inhibitors of growth factor function: for example such         inhibitors include growth factor antibodies and growth factor         receptor antibodies (for example the anti-erbB2 antibody         trastuzumab [Herceptin™ ], the anti-EGFR antibody panitumumab,         the anti-erbB antibody cetuximab [Erbitux, C225] and any growth         factor or growth factor receptor antibodies disclosed by Stern         et al. Critical reviews in oncology/haematology, 2005, Vol. 54,         pp 11-29); such inhibitors also include tyrosine kinase         inhibitors, for example inhibitors of the epidermal growth         factor family (for example EGFR family tyrosine kinase         inhibitors such as         N-(3-chloro-4-fluorophenyl)-7-methoxy-6-(3-morpholinopropoxy)quinazolin-4-amine         (gefitinib, ZD1839),         N-(3-ethynylphenyl)-6,7-bis(2-methoxyethoxy)quinazolin-4-amine         (erlotinib, OSI-774) and         6-acrylamido-N-(3-chloro-4-fluorophenyl)-7-(3-morpholinopropoxy)-quinazolin-4-amine         (CI 1033), erbB2 tyrosine kinase inhibitors such as lapatinib,         inhibitors of the hepatocyte growth factor family, inhibitors of         the platelet-derived growth factor family such as imatinib,         inhibitors of serine/threonine kinases (for example Ras/Raf         signalling inhibitors such as farnesyl transferase inhibitors,         for example sorafenib (BAY 43-9006)), inhibitors of cell         signalling through MEK and/or AKT kinases, inhibitors of the         hepatocyte growth factor family, c-kit inhibitors, abl kinase         inhibitors, IGF receptor (insulin-like growth factor) kinase         inhibitors; aurora kinase inhibitors (for example AZD1152,         PH739358, VX-680, MLN8054, R763, MP235, MP529, VX-528 AND         AX39459) and cyclin dependent kinase inhibitors such as CDK2         and/or CDK4 inhibitors;     -   (v) antiangiogenic agents such as those which inhibit the         effects of vascular endothelial growth factor, [for example the         anti-vascular endothelial cell growth factor antibody         bevacizumab (Avastin™) and VEGF receptor tyrosine kinase         inhibitors such as         4-(4-bromo-2-fluoroanilino)-6-methoxy-7-(1-methylpiperidin-4-ylmethoxy)quinazoline         (ZD6474; Example 2 within WO 01/32651),         4-(4-fluoro-2-methylindol-5-yloxy)-6-methoxy-7-(3-pyrrolidin-1-ylpropoxy)quinazoline         (AZD2171; Example 240 within WO 00/47212), vatalanib (PTK787; WO         98/35985) and SU11248 (sunitinib; WO 01/60814), compounds such         as those disclosed in International Patent Applications         WO97/22596, WO 97/30035, WO 97/32856 and WO 98/13354 and         compounds that work by other mechanisms (for example linomide,         inhibitors of integrin αvβ3 function and angiostatin)];     -   (vi) vascular damaging agents such as Combretastatin A4 and         compounds disclosed in International Patent Applications WO         99/02166, WO 00/40529, WO 00/41669, WO 01/92224, WO 02/04434 and         WO 02/08213;     -   (vii) antisense therapies, for example those which are directed         to the targets listed above, such as ISIS 2503, an anti-ras         antisense;     -   (viii) gene therapy approaches, including for example approaches         to replace aberrant genes such as aberrant p53 or aberrant BRCA1         or BRCA2, GDEPT (gene-directed enzyme pro-drug therapy)         approaches such as those using cytosine deaminase, thymidine         kinase or a bacterial nitroreductase enzyme and approaches to         increase patient tolerance to chemotherapy or radiotherapy such         as multi-drug resistance gene therapy; and     -   (ix) immunotherapy approaches, including for example ex-vivo and         in-vivo approaches to increase the immunogenicity of patient         tumor cells, such as transfection with cytokines such as         interleukin 2, interleukin 4 or granulocyte-macrophage colony         stimulating factor, approaches to decrease T-cell anergy,         approaches using transfected, immune cells such as         cytokine-transfected dendritic cells, approaches using         cytokine-transfected tumor cell lines and approaches using         anti-idiotypic antibodies.

In one embodiment the anti-tumor treatment defined herein may involve, in addition to the compounds of the invention, treatment with other antiproliferative/antineoplastic drugs and combinations thereof, as used in medical oncology, such as alkylating agents (for example cis-platin, oxaliplatin, carboplatin, cyclophosphamide, nitrogen mustard, melphalan, chlorambucil, busulphan, temozolamide and nitrosoureas); antimetabolites (for example gemcitabine and antifolates such as fluoropyrimidines like 5-fluorouracil and tegafur, raltitrexed, methotrexate, cytosine arabinoside, and hydroxyurea); antitumor antibiotics (for example anthracyclines like adriamycin, bleomycin, doxorubicin, daunomycin, epirubicin, idarubicin, mitomycin-C, dactinomycin and mithramycin); antimitotic agents (for example vinca alkaloids like vincristine, vinblastine, vindesine and vinorelbine and taxoids like taxol and taxotere and polokinase inhibitors); and topoisomerase inhibitors (for example epipodophyllotoxins like etoposide and teniposide, amsacrine, topotecan and camptothecin).

In one embodiment the anti-tumor treatment defined herein may involve, in addition to the compounds of the invention, treatment with gemcitabine.

Such conjoint treatment may be achieved by way of the simultaneous, sequential or separate dosing of the individual components of the treatment. Such combination products employ the compounds of this invention, or pharmaceutically acceptable salts thereof, within the dosage range described hereinbefore and the other pharmaceutically active agent within its approved dosage range.

EXAMPLES

The following examples, including the experiments conducted and results achieved are provided for illustrative purposes only and are not to be construed as limiting upon the teachings herein.

Example 1 Immunization and Titering Immunization

Immunizations were conducted using soluble uPAR (recombinant human uPAR/His6, Cat. #807-UK-100, R&D Systems, Inc.) and cell-bound uPAR (B300.19 transfectants expressing human uPAR at the cell surface), respectively. For the generation of a B300.19 transfectant, human full length uPAR cDNA was inserted into the pcDNA 3 expression vector. B300.19 cells were transiently transfected via electroporation. Expression of human uPAR on the cell surface at a level suitable for immunization was confirmed by Fluorescence-Activated Cell Sorter (FACS) analysis. Ten μg/mouse for soluble protein for Campaign 1, and 1×10⁷ cells/mouse of B300.19 transfected cells for Campaign 2, were used for immunization in XenoMouse™ according to the methods disclosed in U.S. patent application Ser. No. 08/759,620, filed Dec. 3, 1996 and International Patent Application Nos. WO 98/24893, published Jun. 11, 1998 and WO 00/76310, published Dec. 21, 2000, the disclosures of which are hereby incorporated by reference. The immunization programs are summarized in Table 2.

Selection of Animals for Harvest by Titer

Titers of the antibody against human uPAR were tested by FACS. At the end of the immunization program, fusions were performed using mouse myeloma cells and lymphocytes isolated from the spleens and lymph nodes of the immunized mice by means of electroporation, as described in Example 2.

TABLE 2 Summary of Immunization Programs No of Immunization Campaign Group Immunogen Strain mice routes 1 1 Soluble uPAR IgG2 10 Fp, twice/wk, × (R&D 807-UK) 4 wks 1 2 Soluble uPAR IgG4 10 Fp, twice/wk, × (R&D 807-UK) 4 wks 2 3 Cell-bound IgG2 10 Fp, twice/wk, × uPAR (B300.19 4 wks transfectants) 2 4 Cell-bound IgG4 10 Fp, twice/wk, × uPAR(B300.19) 4 wks transfectants) “Fp” refers to “foot pad”

Example 2 Recovery of Lymphocytes, B-Cell Isolations, Fusions and Generation of Hybridomas

Immunized mice were sacrificed by cervical dislocation, and the draining lymph nodes harvested and pooled from each cohort. The lymphoid cells were dissociated by grinding in DMEM to release the cells from the tissues and the cells were suspended in DMEM. The cells were counted, and 0.9 ml DMEM per 100 million lymphocytes added to the cell pellet to resuspend the cells gently but completely. Using 100 μl of CD90+ magnetic beads per 100 million cells, the cells were labeled by incubating the cells with the magnetic beads at 4° C. for 15 minutes. The magnetically labeled cell suspension containing up to 10⁸ positive cells (or up to 2×10⁹ total cells) was loaded onto a LS+ column and the column washed with DMEM. The total effluent was collected as the CD90-negative fraction (most of these cells were expected to be B cells).

The fusion was performed by mixing washed enriched B cells from above and nonsecretory myeloma P3X63Ag8.653 cells purchased from ATCC, cat. #CRL 1580 (Kearney et al, J. Immunol. 123, 1979, 1548-1550) at a ratio of 1:1. The cell mixture was gently pelleted by centrifugation at 800×g. After complete removal of the supernatant, the cells were treated with 2-4 mL of Pronase solution (CalBiochem, cat. #53702; 0.5 mg/ml in PBS) for no more than 2 minutes. Then 3-5 ml of FBS was added to stop the enzyme activity and the suspension was adjusted to ml total volume using electro cell fusion solution, (ECFS, 0.3M Sucrose, Sigma, Cat#S7903, 0.1 mM Magnesium Acetate, Sigma, Cat#M2545, 0.1 mM Calcium Acetate, Sigma, Cat#C4705). The supernatant was removed after centrifugation and the cells were resuspended in 40 ml ECFS. This wash step was repeated and the cells again were resuspended in ECFS to a concentration of 2×10⁶ cells/ml.

Electro-cell fusion was performed using a fusion generator (model ECM2001, Genetronic, Inc., San Diego, Calif.). The fusion chamber size used was 2.0 ml, using the following instrument settings:

Alignment condition: voltage: 50 V, time: 50 sec.

Membrane breaking at: voltage: 3000 V, time: 30 μsec

Post-fusion holding time: 3 sec

After ECF, the cell suspensions were carefully removed from the fusion chamber under sterile conditions and transferred into a sterile tube containing the same volume of Hybridoma Culture Medium (DMEM, JRH Biosciences), 15% FBS (Hyclone), supplemented with L-glutamine, pen/strep, OPI (oxaloacetate, pyruvate, bovine insulin) (all from Sigma) and IL-6 (Boehringer Mannheim). The cells were incubated for 15-30 minutes at 37° C., and then centrifuged at 400×g (1000 rpm) for five minutes. The cells were gently resuspended in a small volume of Hybridoma Selection Medium (Hybridoma Culture Medium supplemented with 0.5×HA (Sigma, cat. #A9666)), and the volume adjusted appropriately with more Hybridoma Selection Medium, based on a final plating of 5×10⁶ B cells total per 96-well plate and 200 μl per well. The cells were mixed gently and pipetted into 96-well plates and allowed to grow. On day 7 or 10, one-half the medium was removed, and the cells re-fed with Hybridoma Selection Medium.

Hybridomas were grown as routine in the selective medium. Exhaustive supernatants collected from the hybridomas that potentially produce anti-human uPAR antibodies were subjected to subsequent screening assays.

Example 3 Binding to Cell-Bound hu-uPAR

Binding of the antibodies to cell-bound uPAR was tested with the murine pre-B cell line B300.19 (ATCC) transfected to express human uPAR, and B300.19 parental cells as a control, using Fluorometric Microvolume Assay Technology (FMAT). 5,000 cells/well were employed for the assay. Mouse anti-human uPAR mAb (R & E Systems, MAB807) was used as positive control reagent, whereas, G2 KLH supernatant (1:10) was used as negative control reagent. The bound antibodies were detected using goat anti-human IgG Cy5 conjugate at 400 ng/ml (goat anti-mouse IgG Cy5 conjugate for mouse antibody control). The positive lines were confirmed by FACS analysis by detecting the bound antibodies with both goat anti-human κ-PE or goat anti-human γ-Cy5 conjugates, at 5 μg/ml and 2.5 μg/ml (both were purchased from Jackson Immune Research), respectively. For each dye stained, the ratio of the GeoMean values between positive and negative cells were tabulated. Ratios above 1.95 were considered as hits. The number of human γ and κ specific hits from each fusion are listed in Table 3.

TABLE 3 Number of Antibodies that bound to cell-bound hu-uPAR as confirmed by FACS analysis No. specific γ/κ Fusions positive lines 1 168 2 37 3 169 4 69 Total 443

Example 4 Competitive Binding

The ability of the antibodies to inhibit binding of human uPA to cell-bound uPAR was tested by FACS analysis in this assay. Briefly, murine fibroblast L929 cells (ATCC) were transfected to express human uPAR. Transfectants with 99% viability were incubated with 1:2 dilution of the supernatants at 4° C. overnight. After washing, the cells were incubated with 500 ng/ml FITC-labelled tc-uPA (purchased from Molecular Systems) for an hour. Bound FITC-uPA was detected using rabbit anti-FITC conjugated with biotin (2.5 μg/ml, purchased from Molecular Probes). To amplify the signal, a tertiary detection reagent, streptavidin-Cy5 conjugate (SA-Cy5, 2.5 μg/ml, purchased from Jackson immune Research), was employed. Monoclonal anti-human uPAR antibody MAB807 (R&D Systems, neutralizing receptor-ligand binding) was used as positive control reagent.

A total of 433 supernatants from hybridoma lines (binders) were tested, and 50% of inhibition was considered as positive. The positive lines (neutralizers) from each fusion are summarized Table 4. Among the four fusions, there are 102 lines in total that were able to inhibit binding of uPA to uPAR.

TABLE 4 Number of Abs that inhibited uPA/uPAR binding Fusion No. tested (binders) No. neutralizers 1 168 63 2 37 11 3 169 17 4 69 11 Total 443 102

Example 5 Cross-Reactivity to Non-Human Primates

uPAR derived from cynomolgus monkey was cloned and expressed on the surface of CHOK1 cells. The binding of the antibodies to cell-bound cynomolgus uPAR (with parental cells as negative control) was tested by FACS analysis in this assay. A murine anti-human uPAR antibody MAB807 (R&D Systems) was employed as a positive control reagent. Briefly, CHOK1/cyno-uPAR transfectants with 99% viability were incubated with 1:2 dilution of the supernatants at 4° C. The bound human antibodies were detected using both goat anti-human γ chain Cy5 conjugate (5 μg/ml) and anti-human K chain PE conjugate (2.5 μg/ml), both purchased from Jackson Immunology Research. For each dye stained, the ratio of the GeoMean values between positive and negative cells were found. The ratios above 1.95 were considered hits. Only the lines that demonstrated inhibitory activity to uPA/uPAR binding (neutralizers) were subjected to this assay. As summarized in Table 5, 90 out of 102 lines that were tested showed binding ability to cyno-uPAR expressed on the surface of CHOK1 cells. The cross-reactivity to cynomolgus monkey uPAR was confirmed after 30 candidates were cloned and purified, as shown in Example 12 below.

TABLE 5 Number of Abs that bound to cells expressing cynomolgus uPAR No. tested No. of γ/κ positives Fusion (neutralizers) (cyno reactive) 1 63 59 2 11 8 3 17 14 4 11 9 Totals: 102 90

Example 6 Kinetic Assays High Antigen (HA) Quantitation (ELISA)

ELISA plates were coated with a greater amount of uPAR in comparison with the Limited Antigen Quantitation assay described below (4.2 μg/mL). Sample containing antibody (Ab) was titrated on the uPAR-coated ELISA plates and was incubated overnight to allow Ab binding to approach equilibrium. Titration of Ab in sample covered a dilution range of 1:200 to 1:19, 531. A standard curve of uPAR-specific antibody of known concentration was used to define the linear range of the assay. Data within the linear range were used to derive the relative concentration of uPAR-specific Ab in each titrated sample. The high uPAR concentration and the overnight incubation limited the effect of Ab affinity, allowing quantitation of the relative amount of uPAR-specific Ab present in each sample.

Limited Antigen (LA) Quantitation (ELISA)

ELISA plates were coated with a lower amount of uPAR in comparison with the High Antigen Quantitation assay described below (320, 160, 80, and 20 ng/mL). Samples containing one concentration of antibody (Ab) (1:25 dilution) were incubated overnight to allow Ab binding to approach equilibrium. The low antigen concentration limited the effect of antibody concentration, allowing ranking of the antibodies based on their relative affinity.

102 lines that had the ability to inhibit uPA/uPAR binding (neutralizers), were tested by the HA/LA kinetics assay. The results were analyzed, in combination with the efficacy of uPA/uPAR binding inhibition and FACS-based binding. Table 6 summarizes the results for the 30 hybridoma lines that had the desired neutralizing activity and preferred binding kinetics.

Example 7 Specificity Study

The closest homologue to uPAR is human Ly6e (about 36% similarity). In this study, all antibodies that cross-reacted to Ly6e were identified and excluded.

Human Ly6e (Genbank Accession No. BC119709) was cloned and expressed in HEK293T cells according to standard protocols. Due to the lack of the appropriate detection antibody, the authenticity of the expression of Ly6e was confirmed by probing a myc tag fused on the molecule, as well as demonstrating the right molecular size of the expressed protein on a Western Blot using the same anti-myc antibody.

The reactivity of the antibodies to the HEK293T transfected to express Ly6e was determined by FACS analysis, using 1:2 hybridoma supernatants, and probed with goat anti-human γ chain conjugated with Cy5 (2.5 mg/ml, Jackson Immune Research). Binding of an anti-myc antibody (10 μg/ml, Invitrogen) to the transfectants served as a positive control, and binding of this antibody to the (Ly6e negative) parental cells served as the negative control. The GeoMean ratio to the positive vs negative at 1.95 was used as a threshold. Readings above 1.95 were considered as binders. As a result, among 102 neutralizers, only lines 4.67 and 4.50 were found to bind to Ly6e-expression cells. The others had no cross-reactivity to Ly6e. Table 6 summarizes properties of 30 lines selected for cloning.

TABLE 6 Summary on the Selection of 30 Lines for Cellular Cloning Cell-based Efficacy Binding Ab Affinity Ranking uPA/uPAR gCy5 Geo concentration LA at 80 LA at 20 binding Mean Pos Cyno Cross Line ID Avg (ug/ml) ng/ml ng/ml Inhibition % Cells Reactivity 1 1.100 65.95 2.15 0.27 78 521 Yes 2 1.113 25.2 1.8 0.53 75 511 Yes 3 1.159 15.9 2.12 0.33 75 491 Yes 4 1.163 33.87 2.64 0.34 73 410 Yes 5 1.2 13.53 1.89 0.56 74 388 Yes 6 1.20 35.22 1.37 0.2 74 467 Yes 7 1.35 8.61 1.1 0.34 75 497 Yes 8 1.4 9.01 0.66 0.16 69 419 Yes 9 1.41 13.1 1.48 0.27 74 422 Yes 10 1.52 3.7 2 0.27 74 516 Yes 11 1.61 62.64 1.99 0.27 69 559 Yes 12 1.76 13.06 1.47 0.4 75 538 Yes 13 1.85 5.74 1.61 0.26 74 494 Yes 14 2.19 6.88 2.65 0.65 85 445 Yes 15 2.6 2.8 3.58 0.63 80 455 Yes 16 3.104 31.79 0.25 0.16 74 302 Yes 17 3.133 113.62 0.32 0.07 72 440 No 18 3.14 33.27 0.51 0.08 74 317 Yes 19 3.140 68.55 1.6 0.4 69 418 Yes 20 3.167 1230.59 0.28 0.09 74 336 No 21 3.176 22.09 0.96 0.22 76 392 Yes 22 3.179 13.95 0.09 0.07 72 371 Yes 23 3.8 19.2 2.57 0.67 70 451 Yes 24 4.12 48.62 0.21 0.06 71 317 Yes 25 4.13 89.59 0.24 0.09 78 282 Yes 28 4.18 2.44 2.06 0.27 75 251 Yes 27 4.19 4.24 1.03 0.16 77 412 Yes 28 4.50 1.08 0.64 0.21 67 402 Yes 29 4.65 0.46 0.13 0.06 80 431 Yes 30 4.68 33.33 0.11 0.07 78 208 Yes

Through the primary and secondary screening assays, a total of 30 hybridoma lines were identified based on their ability to bind to the cell-bound human uPAR, inhibition of uPA/uPAR binding, and kinetics ranking, as summarized in Table 6. Among them, two lines did not bind on cyno-uPAR on the cell surface. None of the antibodies reacted with murine uPAR and none of the selected lines reacted with Ly6e, the closest homologue of uPAR.

These 30 lines were cloned and further characterized as described below.

Example 8 Plasminogen Activation Assay

Human histocytic lymphoma cell line U937 (ATCC), which is known to express uPAR, was employed for this assay. Upon binding to the cell surface uPAR, single chain urokinase type plasminogen activator (scuPA) can be activated into uPA, and can cleave plasminogen to plasmin. The latter cleaves D-Val-Leu-Lys 7-Amido-4-methylcoumarin (VLK-AMC, Sigma catalog number V3138) and releases the fluorescent AMC dye. Hence, the intensity of Fluorescence Unit in the assay system indicates the quantity of bound uPA to cell surface uPAR. The neutralizing mAbs against uPAR were expected to inhibit binding of scuPA, and thus, suppress the fluorescence.

U937 cells were maintained and propagated in RPMI. 1640 medium with 2 mM L-glutamine adjusted to contain 1.5 g/L sodium bicarbonate, 4.5 g/L glucose, 10 mM HEPES, 1.0 mM sodium pyruvate, and 10% FBS at 37° C. with 5% CO₂. To perform the assay, U937 cells were seeded at the density of 60,000 cells/well into a V-bottom plate, and were washed with cold reaction buffer (0.05 M Tris.HCl, 0.1 M NaCl, pH=7.4, with 2% BSA) by spinning cells down at 1,500 rpm for 3 min. After resuspension, the cells were treated with mAbs at indicated final concentrations for one hour on ice. The treated cell suspensions were spiked with scuPA at a final concentration of 3 nM. The cell suspensions were incubated on ice for one hour prior to being washed with cold reaction buffer. 50 μl of 1 μM Glu-plasminogen and 400 μM VLK-AMC substrate were added to the cell suspensions whose volumes were adjusted to 200 μl. The mixtures were transferred to a FMAT plate for fluorescence determination with a Tecan reader.

30 mAbs were initially tested in the plasminogen activation assay. 15 candidates with higher plasminogen activation inhibitory activity than others were then selected for further testing. The dose-response relationship curves for the 15 selected mAbs were generated by testing their inhibitory activities at various concentrations, as indicated in FIG. 1. Tests were run in triplicate for each mAb concentration. A quantitative index, IC50, for each mAb is included in Table 11.

It was noticed that there was an obvious gap between the curves for antibodies 4.19.1 and 1.41.1. The curves on the left of the gap (including 8 mAbs, namely, 4.18.1, 4.50.2, 4.13.2, 4.12.2, 2.6.1, 1.99.1, 2.19.2, and 4.19.1) had higher efficacy and potency. They inhibited plasminogen activation at greater than 90% at concentrations as low as 1 μg/ml. Therefore, these 8 mAbs were selected for further characterization.

Example 9 Adhesion Assay

A 96-well microtiter plate was coated with vitronectin (5 μg/ml) in sodium phosphate (pH 9) at 4° C. overnight. The plate was then blocked with 3% BSA in room temperature for at least an hour. U937 cells were acid-stripped using 2.5 ml of 50 mM glycine-HCl and 100 mM NaCl (pH 3.0) on ice for 3 min. The acidic cell suspension was then neutralized by 0.5 ml of 500 mM HEPES and 100 mM NaCl (pH 7.0).

The cells were then washed twice with pre-warmed serum-free medium, and twice again with HBBS containing 1% BSA and free of Mn²⁺, before they were finally resuspended in HBBS at 180,000 cells/100 μL. The acid-stripped cells were then incubated with a pre-chosen mAb at 10 μg/ml for 1 hour at 4° C. The cells were subsequently spiked with 25 nM scuPA.

50 μl of cells and their pre-chosen mAb were added into each of the vitronectin-coated wells in the microtiter plate. The cells were allowed to adhere to the plate at 37° C. for 40 min. Unbound cells were washed off using warm HBSS. The bound cells were frozen by placing the plate in −80° C. for 1 hour. The cells were than thawed at room temperature. 100 ml of the CyQuant dye/lysis buffer were added to each well, and the fluorescence was read at 485 nm excitation and 530 nm emission.

The 15 selected mAbs from Example 8 were subjected to the adhesion assay at 2 μg/ml initially. When 8 mAbs that inhibited adhesion were found, the dose-response relationship curves for them were obtained in triplicate, as illustrated in FIG. 2. The remaining 7 mAbs did not show an obvious inhibitory effect under the defined experimental conditions.

Neither human isotype IgGs nor goat IgG control inhibited adhesion of U937 to vitronectin. Similar to the goat anti-uPAR, which is a known neutralizer (black thick dot line, FIG. 2), these inhibitory 8 mAbs inhibited cell adhesion to vitronectin in a dose-dependent manner. The left-most group of the curves in the graph is composed of mAb 4.18.1, 2.6.1, 2.19.2, and 4.50.2. The maximum mAb concentration tested in the assay was 2 μg/ml. At this concentration, at least mAb 2.19.2 and 2.6.1 reach 90% of inhibition, and mAb 4.18.1 approaches 90% inhibition of uPAR-mediated cell adhesion to vitronectin. This experiment was repeated three times with similar results.

The correlation of the anti-adhesion activity to other features of the antibodies is summarized in Table 11.

Example 10 Invasion Assay

Matrigel™ (BD Biosciences Cat#356237 Lot #007024—7.7 mg/ml) was defrosted on ice in a 4° C. refrigerator overnight. 80 μl of the gel was added to each well in a BD 24-well Transwell Plate with pore size of 8 μm, and incubated at 37° C. for 90 min prior to cell attachment. HT-1080 cells were re-suspended using cell-dissociation solution (Sigma) at 1×10⁵ cell/ml in DMEM (0.2% FCS) media. 100 μl (1×10⁴ cells) of the cell suspension was aliquoted to sterile eppendorf tubes and pre-incubated with the mAbs at final concentrations of 0.1, 1.0, and 10 μg/ml at 37° C. for 1 hour with occasional mixing. Untreated control samples were also pre-incubated at 37° C. for 1 hour with occasional mixing.

750 μl of DMEM (10% FCS) media supplemented with the mAbs at 0.1, 1.0, and 10 μg/ml was added to the appropriate wells of lower transwell chamber. 750 μl of DMEM (10% FCS) media was added to lower chamber of control samples. The upper chambers containing solidified Matrigel™ were inserted into lower transwell chambers, and 100 μl (1×10⁴ cells) of pre-incubated cell suspension was aliquoted to the upper chamber of appropriate wells, and the chambers were incubated at 37° C. for 3 days. The transwells were fixed by immersing in −20° C. methanol for 20 minutes at room temperature. The transwells were washed twice in PBS before being stained with Hoechst 33342 (Sigma catalog number B2261) (10 μM). After staining, the wells were washed twice with PBS. Using a 20× objective, optical images of cells on top of Matrigel™ and invaded cells at sequential 20 μm sections through the Matrigel™ were obtained. Image-ProPlus (Media Cybernetics, Bethesda, Md.) image analysis software package was employed to calculate cell number at each section. For each sample, data were presented as the percentage number of cells present in all sections that had invaded over a specified distance (60-200 μm).

The 15 mAbs from Example 8, together with isotype controls (PK16.3.1 for IgG2, 108.2.1 for IgG4), were tested in the assay at the mAb concentration of 0.1, 1.0, and 10 μg/ml. The number of cells invading beyond 60 μm in distance was normalized to the “fold change over IgG2 and IgG4 isotype control.” The three panels in FIG. 3 represent the data collected with mAb concentration at 0.1, 1.0, and 10 μg/ml, respectively, from top to bottom. Most of the mAbs tested were found to inhibit cell invasion. Antibodies 2.19.1, 2.6.1 and 4.18.1 had the best efficacy and potency. At a concentration of 10 μg/ml, mAb 2.19.1 completely inhibited invasion beyond a 60 μm distance, and both mAbs 2.6.1 and 4.18.1 achieved 90% inhibition. Subsequently, analysis of 2.6.1, 2.19.2 and 4:18.1 was carried out over the concentration range 0.1-100 ng per ml and invasion was determined by the number of cells invading through Matrigel™ at a depth of 80 μM. As demonstrated in FIG. 5, mAbs 2.6.1, 2.19.2 and 4.18.1 at a concentration of 100 ng/ml were found to significantly (>70% inhibition) inhibit cell migration to 80 μm.

Example 11 Determination of Affinity Using Low and High Resolution Biacore™ Low Resolution Biacore™

For the low resolution Biacore™ tests, a selection of 31 hybridoma cell line products or hybridoma supernatants were tested for affinity determination. A high-density goat anti-human antibody surface over a CM5 Biacore™ chip was prepared using routine amine coupling. All mAbs were diluted to approximately 6 μg/mL in HBS-P running buffer (10 mM HEPES [pH 7.4], 150 nM NaCl, 0.005% surfactant P20) containing 100 μg/ml BSA. Each mAb was captured on a separate flow cell using a 30-second contact time at 10 μL/min followed by a 5-minute wash at a 100 μL/min flow rate for stabilization of the mAb baseline. Next, hu-uPAR (R&D Systems, Lot ALH01402A) was injected at 312 nM (23° C.) over all surfaces for 90 sec., followed by a 5-minute dissociation (100 μL/min flow rate). Four-mAbs were re-analyzed with a 4-minute hu-uPAR injection (312 nM, 50 μL/min flow rate). All antigen samples were prepared in the running buffer. The surfaces were regenerated after every capture/injection cycle with one 15-second pulse of 146 mM phosphoric acid (pH 1.5).

The baseline drift of a buffer injection prior to each antigen injection was subtracted for each cycle.

Data were fit globally to a 1:1 interaction model using CLAMP (David G. Myszka and Thomas Morton (1998) “CLAMP©: a biosensor kinetic data analysis program,” TIBS 23, 149-150) to determine the binding kinetics. A mass transport coefficient was used in fitting the data. The kinetic analysis results are listed in Table 7a. The mAb supernatants used in the analysis are also indicated. MAbs are ranked from high to low affinity.

TABLE 7a Affinity Determination Results for the Hybridoma Lines Derived from Low Resolution Biacore ™ Amt. Captured Sample (RU) k_(a) (M⁻¹s⁻¹) k_(d) (s⁻¹) K_(D) (nM) 2.19 299 1.4 × 10⁵ 4.3 × 10⁻⁵ 0.31 2.6 290 8.1 × 10⁴ 4.6 × 10⁻⁵ 0.57 3.29 249 2.7 × 10⁴ 3.1 × 10⁻⁵ 1.1 4.18 384 1.1 × 10⁵ 1.6 × 10⁻⁴ 1.5 4.50 298 1.2 × 10⁵ 2.6 × 10⁻⁴ 2.2 1.100 566 7.5 × 10⁴ 1.7 × 10⁻⁴ 2.3 4.65 291 1.1 × 10⁵ 2.5 × 10⁻⁴ 2.3 1.61 459 9.4 × 10⁴ 2.5 × 10⁻⁴ 2.7 4.19 227 1.2 × 10⁵ 3.2 × 10⁻⁴ 2.7 3.140 443 7.0 × 10⁴ 2.1 × 10⁻⁴ 3.0 3.8 427 2.2 × 10⁴ 6.8 × 10⁻⁵ 3.1 3.104 228 8.7 × 10⁴ 3.0 × 10⁻⁴ 3.4 1.99 509 1.2 × 10⁵ 4.2 × 10⁻⁴ 3.5 3.14 274 9.8 × 10⁴ 3.4 × 10⁻⁴ 3.5 1.35 546 3.8 × 10⁴ 1.5 × 10⁻⁴ 3.9 1.41 718 3.3 × 10⁴ 1.3 × 10⁻⁴ 3.9 3.176(supe) 239 5.3 × 10⁴ 2.3 × 10⁻⁴ 4.3 3.117 (supe) 459 9.8 × 10⁴ 4.3 × 10⁻⁴ 4.4 1.113 694 2.8 × 10⁴ 1.3 × 10⁻⁴ 4.6 1.85 434 3.0 × 10⁴ 1.4 × 10⁻⁴ 4.7 4.68 209 5.3 × 10⁴ 2.9 × 10⁻⁴ 5.5 1.20 224 7.7 × 10⁴ 4.5 × 10⁻⁴ 5.8 1.163 662 7.4 × 10³ 4.6 × 10⁻⁵ 6.2 1.2 (supe) 464 1.7 × 10⁴ 1.3 × 10⁻⁴ 7.6 1.4 321 1.1 × 10⁵ 9.6 × 10⁻⁴ 8.7 1.159 975 1.6 × 10⁴ 1.4 × 10⁻⁴ 8.7 4.13 161 9.5 × 10⁴ 1.2 × 10⁻³ 12.6 4.12 154 6.3 × 10⁴ 1.3 × 10⁻³ 20.6 3.133 324 9.5 × 10⁴ 3.6 × 10⁻³ 37.9 3.179 308 5.4 × 10⁴ 2.2 × 10⁻³ 40.7 3.167 414 6.6 × 10⁴ 3.9 × 10⁻³ 59.1

Most Abs fit a 1:1 model very well. The off-rate data for mAbs 3.133 and 3.167 showed some complexity, but the kinetic parameters are acceptable estimates. The longer 4-minute injection time in the analysis of mAb 1.163 still did not produce significant curvature in the on-rate data because the association rate was slow (on the order of 10³ M⁻¹s⁻¹).

High Resolution Biacore™

Considering that most mAbs fit a 1:1 model very well, the affinity ranking derived from the line product low resolution Biacore™ was believed to be reliable. The Kd determination using high resolution Biacore™ with three (3) cloned and purified mAbs was conducted in separate experiments.

Each of three purified mAbs (2.19.2, 2.6.1 and 4.18.1) were amine coupled on a different flow cell surface of a CM5 Biacore™ chip and tested for their binding affinity to human uPAR. All mAbs were diluted into 10 mM sodium acetate, pH 4.0 for immobilization. The running buffer and sample preparation buffer for all experiments were degassed HBS-P (10 mM HEPES [pH 7.4], 150 nM NaCl, 0.005% surfactant P20) containing 100 μg/mL BSA. All experiments were run at 23° C. with a flow rate of 100 μL/min. Serially diluted (2-fold) uPAR samples were randomly injected in triplicate for 90 seconds with several buffer injections interspersed for double referencing. A Biacore™ 2000 biosensor instrument was used for all high resolution experiments. Data were fit globally to a 1:1 interaction model with a term for mass transport included. The resulting K_(D) values are summarized in Table 7b.

TABLE 7b Affinity Determination Results for Cloned and Purified mAbs Derived from High Resolution Biacore ™ mAb K_(D) (pM) 2.19.2 175 2.6.1  249 4.18.1 446

The Kd values for antibodies 2.19.2, 2.6.1, and 4.18.1 were 175 pM, 249 pM, and 446 pM, respectively. The Kd ranking of each antibody with high resolution Biacore™ was consistent with that obtained via low resolution Biacore™.

Example 12 Cross-Reactivity to Mouse and Monkey uPAR

For determination of the mouse cross-reactivity, the mAb's binding to human uPAR expressed on the surface of U937 cells was detected in a competition assay using excess soluble mouse uPAR. In the assay, excess amounts of the recombinant mouse uPAR were preincubated with the mAbs before the mAbs were exposed to the cells expressing uPAR. If a mAb cross-reacted with the mouse uPAR, the preincubation would mask the mAb, thus, it would not bind to human uPAR.

A mouse uPAR/human IgG Fc chimera (uPARHuIgG) (R&D Systems, catalog number 531-PA-100) was used for the mouse uPAR. 50 μl of each mAb at 1 μg/mL was mixed with equal volume of the mouse uPARHuIgG 40 μg/mL. The final concentrations of the mAbs and mouse uPAR were 500 ng/mL and 20 μg/mL, respectively (Approx. M, W, of Mo-uPARHuIg is 66-90 Kd). The mixture was in FACS buffer (PBS supplemented with 1% BSA and 0.05% NaN₃), and was incubated for 30 min. Subsequently, 20,000 U397 cells were added into the mixture for an additional 30 minute incubation on ice. At the end of incubation, unbound mAbs were intensively eliminated by washing five times using FACS buffer. The bound mAbs were detected with Cy5 (Cy5-bis-OSU, N,N′-biscarboxypentyl-5,5′-disulfonatoindodicarbocyanine, Amersham Life Science, catalog No. PA15000)-labeled goat anti-Hu IgG Fc (5.0 μg/mL) and 7AAD (5.0 μg/mL) using a FACSCalibur flow cytometer (BD Biosciences, San Jose, Calif.).

The results showed that the excess amounts of soluble recombinant mouse uPAR did not block the binding of any mAb to cell-bound human uPAR (data not shown), indicating that none of the mAbs cross-reacted to the mouse uPAR. To make the mouse cross-reactivity results conclusive, direct binding of the mAbs to cell-bound mouse uPAR was measured using FACS analysis; The mouse cell line derived from the connective tissue, NCTC L929, was employed for FACS analysis. The harvested cells were resuspended at 50,000 cells/well using FACS buffer into a V-bottom plate which was put on ice. The uPAR mAbs at the final concentration of 6.25 μg/ml were added into the wells, and incubated for 1 hour on ice. After washing, Cy5-labeled goat anti-human IgG Fc at 5 μg/ml and 7AAD at 5 μg/ml was added. The mixtures were incubated for 15 min on ice, washed and resuspended in cold FACS buffer for FACS analysis.

Table 8 summarizes the FACS results. The rat anti-uPAR, which cross-reacts with mouse antigen, generated a great shift with GeoMean of 248.07. In contrast, the GeoMean values for the mouse anti-uPAR mAb (lacks reactivity to mouse antigen), isotype controls from the rat, mouse, and human, together with the secondary antibodies for detection, ranged between 3.14 and 13.07. All the fully human uPAR mAbs showed a GeoMean between 9 and 12, comparable to the background seen in the above negative controls. It was therefore concluded that none of the mAbs bound to the cell surface mouse uPAR.

TABLE 8 Summary of the FACS Analysis Results. Sample X Geo X Geo Sample ID Mean Controls mean 1 1.100.1 9.89 rat anti-uPAR 248.07 2 1.99.1 11.65 Mo anti-uPAR 3.14 4 4.19.1 9.59 Hu IgG2 8.88 isotype 5 4.50.2 8.92 Hu IgG4 8.5 isotype 6 4.12.2 8.97 Hu 2′ 7.63 7 4.18.1 8.18 rat isotype 12.31 12 2.19.2 9.55 rat 2′ 13.07 13 2.6.1 12.95 Mo isotype 3.31 14 1.61.1 9.7 Mo 2′ 3.22 15 4.13.2 11.24 17 1.4.2 12.38 24 1.113.2 10.19 26 1.41.1 9.59 29 1.2.3.3 9.89 30 3.176.2.2 8.36

Prior to the cloning, two out of the 30 selected hybridoma lines, (3.1.33 and 3.167) were shown to lack cross-reactivity to the monkey uPAR. After cloning, the cross-reactivity to the monkey uPAR expressed recombinantly on the surface of 293T cells was confirmed using FACS analysis. The FACS analysis results are summarized in FIG. 4.

In comparison to the negative control antibodies, all the anti-uPAR mAbs bound to the cell-bound monkey uPAR, although the GeoMean values varied widely. Weak binders included mAbs 1.159.1, 1.163.1, 3.14.1 and mAb 1.100.1. Mabs 2.19.2, 2.6.1, and 4.18.1 were found to cross-react to the monkey antigen very strongly (FIG. 4).

Example 13 Cynomolgus Affinity

Kinetic measurements of several of the antibodies were evaluated using the KinExA® method. This method involves solution-based determination of formal affinity measurements at equilibrium. Recombinant human uPAR (amino acids 1-303) purchased from R&D systems was coupled to NHS-Sepharose beads. The remaining active groups on the beads were blocked with 10 mg/ml BSA in 1 M Tris and stored in the blocking solution as recommended by the manufacturer. KinExA experiments were performed using an automated flow immunoassay system, KinExA 3000, in which beads coupled with human uPAR served as the solid phase.

The nucleotide sequence shown as SEQ ID NO: 81 encodes the extracellular domain (ECD) of the cynomolgus protein with an in-frame His tag at the C-terminus (SEQ ID NO: 82). The cynomolgus uPAR was produced by transient transfection of an expression vector containing this nucleotide sequence in HEK293 cells using the Freestyle expression system (Invitrogen) of protein production as per manufacturer's recommendations. The conditioned media from this transient transfection was used for the affinity determination as described above.

Briefly, a constant amount of 2.6.1 or 2.19.2 anti-uPAR antibody (5 nM or 500 pM) was incubated with titrating concentrations of conditioned media containing recombinant cynomolgus uPAR ECD starting at approximately 625 nM. Antigen/antibody complexes were incubated at room temperature for 48 hrs to 168 hrs to allow equilibrium to be reached. The mixture was drawn through the human uPAR-coupled beads to accumulate unbound antibody. The captured antibody was detected using solutions containing a Cy5-conjugated goat anti-human IgG heavy and light chain specific secondary antibody in sample buffer. The bound signals were converted into relative values as a proportion of control in the absence of hIL-13. Three replicates of each sample were measured for all equilibrium experiments. The results are summarized in Table 9 below. The equilibrium dissociation constant (K_(D)) was obtained from nonlinear regression analysis of the data using a one-site homogeneous binding model with an unknown ligand concentration contained within the KinExA software. The software calculates the K_(D) and determines the 95% confidence interval by fitting the data points to a theoretical K_(D) curve. The 95% confidence interval is given as K_(D) low and K_(D) high.

TABLE 9 Summary of KinExA Results for Cynomolgus Binding Activity Antibody K_(D) K_(D) low K_(D) high 2.6.1 1.09 nM 478 pM 2.46 nM 2.19.2  346 pM 234 pM  508 pM

Example 14 Internalization Assay

Eight of the mAbs from Example 8 were tested for the ability to induce uPAR internalization using U937 cells. A cell suspension containing 100,000 cells was pipetted into each well of a V-bottom plates in duplicate. Two V-bottom plates were prepared, one to be kept at 37° C. during internalization with antibody complex, and the other to be incubated at 4° C. Each of the eight uPAR mAbs was incubated with U937 cells at 5 μg/ml on ice for 15 min. Incubation on ice was necessary to prevent internalization of the primary mAbs. The cells were then washed with cold FACS buffer. Cells were subsequently incubated on ice in 100 μl of 5 μg/ml alexa647-labelled goat anti-humanF(ab) (Invitrogen catalogue number A21249) in cold FACS buffer for 15 min. This allowed the goat FAB bind to the bound uPAR mAbs without permitting any internalization. After a 15 minute incubation on ice, one plate was kept on ice, while the other plate was incubated at 37° C. for 1 hour.

Following the 1 hr incubation with the mAb-FAB complex, the cells were washed twice with cold 5% FACS buffer, and 200 μl of Tris(2-carboxyethyl)phosphine HCl (TCEP) was added to each well as a stripping agent. The plates were both incubated with TCEP on ice for 1 hour, followed by washing and resuspending with FACS buffer. 4 μl of 7-Amino-Actinomycin D (7AAD) was added to each well, followed by 10 min incubation on ice before FACS analysis was conducted.

The percentage of internalization was calculated using the following equation:

[(37 strip−4 strip)/(4 no strip−4 strip)]×100

where ‘37 strip’ is the geo mean at 37° C. with TCEP;

‘4 strip’ is the geo mean on ice with TCEP;

‘4 no strip’ is the geo mean on ice without TCEP (see Table 10).

TABLE 10 Summary of the Internalization Assay geo mean geo mean geo mean cold + cold − 37° C. + % Antibody TCEP TCEP TCEP Internalized 2.19.2 2 42.67 3.54 3.7 4.50.2 2.01 42.12 3.2 2.9 4.12.2 2 33.35 3.02 3.2 1.99.1 1.95 42.49 2.69 1.8 2.6.1 2.07 44.34 3.02 2.2 4.13.2 1.95 37.42 2.95 2.8 4.19.1 2.34 45.95 5.31 6.8 4.18.1 2.05 41.2 3.25 3.0

As summarized in Table 10, very little, if any internalization was detected after 1 hour incubation at 37° C. The experiment was repeated twice with similar results.

Table 11 summarizes the results of the in vitro characterization for the 15 candidates from Example 8.

TABLE 11 Summary of the in vitro Characterization Assay Results for Fifteen uPAR mAbs. Human Plasmin- Inva- uPAR/ ogen sion Ab to uPA activa- Low High inhibi- cell binding tion Resolu- Resolu- tion Anti- bound inhibi- inhibi- Cyno Murine tion tion Vitro- (Po- body Ag (line tion tion X- X- Affin- Affin- nectin tency (Clone material, (%, line (IC50, reac- reac- ity (KD, ity (Kd, adhe- Rank- no.) FACS) material) ug/ml) tivity tivity nM) nM) sion ing) 2.19.2 445 85 (1) 0.053(1) Y N  0.31(1) 0.175(1) +(1) Y(1) 2.6.1 455 80 (2) 0.073(4) Y N  0.57(2) 0.249(2) +(4) Y(2) 4.18.1 251 75 (7) 0.067(3) Y N  1.5(3) 0.446(3) +(3) Y(3) 1.99.1 514 78 (3) 0.066(2) Y N  3.5 ND − Y 4.13.2  28.2 78 (4) 0.077(5) Y N 12.6 ND + Y 4.50.2 402 67 0.104 Y N  2.2 ND +(2) Y 4.12.2 317 71 0.067 Y N 20.6 ND − Y 4.19.1 412 77 0.056 Y N  2.7 ND + Y 1.41.1 422 74 0.181 Y N  3.9 ND + Y 3.8.3 451 70 0.328 Y N  3.1 ND − Y 1.4.2 419 69 0.075 Y N  8.7 ND − Y 1.61.1 559 69 0.119 Y N  2.7 ND − Y 1.100.1 521 78 0.061 Y N  2.3 ND − Y 3.176.2 392 76 0.270 Y N  4.3 ND − Y 1.113.2 511 75 0.775 Y N  4.6 ND − Y *The numbers in the parentheses indicate ranking order for each category.

Example 15 Structural Analysis of uPAR Antibodies

The variable heavy chains and the variable light chains of the antibodies were sequenced to determine their DNA sequences. The complete sequence information for the anti-uPAR antibodies is provided in the sequence listing with nucleotide and amino acid sequences for each gamma and kappa chain combination. The variable heavy sequences were analyzed to determine the VH family, the D-region sequence and the J-region sequence. The sequences were then translated to determine the primary amino acid sequence and compared to the germline VH, D and J-region sequences to assess somatic hypermutations.

Table 18 is a table comparing the antibody heavy chain regions to their cognate germ line heavy chain region. Table 19 is a table comparing the antibody kappa light chain regions to their cognate germ line light chain region.

The variable (V) regions of immunoglobulin chains are encoded by multiple germ line DNA segments, which are joined into functional variable regions (V_(H)DJ_(H) or V_(K)J_(K)) during B-cell ontogeny. The molecular and genetic diversity of the antibody response to uPAR was studied in detail. These assays revealed several points specific to anti-uPAR antibodies.

It should be appreciated that amino acid sequences among the sister clones collected from each hybridoma are identical. As an example, the heavy chain and light chain sequences for mAb 2.19.3 would be identical to the sequences for mAbs 2.19 and 2.19.1.

According the sequencing data, the primary structure of the heavy chains of 2.6.1 and 4.18.1 are similar, but not identical. 2.19.2 is structurally different from the other two.

It should also be appreciated that where a particular antibody differs from its respective germline sequence at the amino acid level, the antibody sequence can be mutated back to the germline sequence. Such corrective mutations can occur at one, two, three or more positions, or a combination of any of the mutated positions, using standard molecular biological techniques. By way of non-limiting example, Table 19 shows that the light chain sequence of mAb 4.18.1 (SEQ ID NO.: 52) differs from the corresponding germline sequence (SEQ ID NO.:66) through a Ser to Phe mutation (mutation 1) in the FR1 region, a Val to Met mutation (mutation 2) in the FR1 region, a Lys to Thr mutation (mutation 3) in the FR2 region, a Ile to Phe mutation (mutation 4) in the FR3 region and a Ser to Ile mutation (mutation 5) in the FR3 region. Thus, the amino acid or nucleotide sequence encoding the light chain of mAb 4.18.1 can be modified to change mutation 1 to yield the germline sequence at the site of mutation 1. Further, the amino acid or nucleotide sequence encoding the light chain of mAb 4.18.1 can be modified to change mutation 2 or mutation 3 to yield the germline sequence at the site of mutation 2 or mutation 3. Still further, the amino acid or nucleotide sequence encoding the light chain of mAb 4.18.1 can be modified to change both mutation I and mutation 2, or any other combination of two or more mutations to yield the germline sequence at those particular sites. Tables 12-17 below illustrate the position of such variations from the germline for mAb 2.19.2, 2.6.1 and 4.18.1. Each row represents a unique combination of germline and non-germline residues at the position indicated by bold type.

TABLE 12 Exemplary Mutations of mAb 2.19.2 Light Chain (SEQ ID NO: 32) to Germline at the Indicated Residue Number. 12 32 36 38 100 101 103 A S K Y DELETED T P A S K Y DELETED T W A S K Y DELETED F P A S K Y DELETED F W A S K Y I T P A S K Y I T W A S K Y I F P A S K Y I F W A S K S DELETED T P A S K S DELETED T W A S K S DELETED F P A S K S DELETED F W A S K S I T P A S K S I T W A S K S I F P A S K S I F W A S R Y DELETED T P A S R Y DELETED T W A S R Y DELETED F P A S R Y DELETED F W A S R Y I T P A S R Y I T W A S R Y I F P A S R Y I F W A S R S DELETED T P A S R S DELETED T W A S R S DELETED F P A S R S DELETED F W A S R S I T P A S R S I T W A S R S I F P A S R S I F W A G K Y DELETED T P A G K Y DELETED T W A G K Y DELETED F P A G K Y DELETED F W A G K Y I T P A G K Y I T W A G K Y I F P A G K Y I F W A G K S DELETED T P A G K S DELETED T W A G K S DELETED F P A G K S DELETED F W A G K S I T P A G K S I T W A G K S I F P A G K S I F W A G R Y DELETED T P A G R Y DELETED T W A G R Y DELETED F P A G R Y DELETED F W A G R Y I T P A G R Y I T W A G R Y I F P A G R Y I F W A G R S DELETED T P A G R S DELETED T W A G R S DELETED F P A G R S DELETED F W A G R S I T P A G R S I T W A G R S I F P A G R S I F W S S K Y DELETED T P S S K Y DELETED T W S S K Y DELETED F P S S K Y DELETED F W S S K Y I T P S S K Y I T W S S K Y I F P S S K Y I F W S S K S DELETED T P S S K S DELETED T W S S K S DELETED F P S S K S DELETED F W S S K S I T P S S K S I T W S S K S I F P S S K S I F W S S R Y DELETED T P S S R Y DELETED T W S S R Y DELETED F P S S R Y DELETED F W S S R Y I T P S S R Y I T W S S R Y I F P S S R Y I F W S S R S DELETED T P S S R S DELETED T W S S R S DELETED F P S S R S DELETED F W S S R S I T P S S R S I T W S S R S I F P S S R S I F W S G K Y DELETED T P S G K Y DELETED T W S G K Y DELETED F P S G K Y DELETED F W S G K Y I T P S G K Y I T W S G K Y I F P S G K Y I F W S G K S DELETED T P S G K S DELETED T W S G K S DELETED F P S G K S DELETED F W S G K S I T P S G K S I T W S G K S I F P S G K S I F W S G R Y DELETED T P S G R Y DELETED T W S G R Y DELETED F P S G R Y DELETED F W S G R Y I T P S G R Y I T W S G R Y I F P S G R Y I F W S G R S DELETED T P S G R S DELETED T W S G R S DELETED F P S G R S DELETED F W S G R S I T P S G R S I T W S G R S I F P S G R S I F W

TABLE 13 Exemplary Mutations of mAb 2.19.2 Heavy Chain (SEQ ID NO: 30) to Germline at the Indicated Residue Number. 99-100 DQ DELETED

TABLE 14 Exemplary Mutations of mAb 2.6.1 Light Chain (SEQ ID NO: 28) to Germline at the Indicated Residue Number. 95-96 103 PL K PL R DELETED K DELETED R

TABLE 15 Exemplary Mutations of mAb 2.6.1 Heavy Chain (SEQ ID NO: 26) to Germline at the Indicated Residue Number. 30 31 35 50 53 58 69 81 87 98 S S S V S Y I Q A DELETED S S S V S Y I Q A E S S S V S Y I Q V DELETED S S S V S Y I Q V E S S S V S Y I H A DELETED S S S V S Y I H A E S S S V S Y I H V DELETED S S S V S Y I H V E S S S V S Y V Q A DELETED S S S V S Y V Q A E S S S V S Y V Q V DELETED S S S V S Y V Q V E S S S V S Y V H A DELETED S S S V S Y V H A E S S S V S Y V H V DELETED S S S V S Y V H V E S S S V S S I Q A DELETED S S S V S S I Q A E S S S V S S I Q V DELETED S S S V S S I Q V E S S S V S S I H A DELETED S S S V S S I H A E S S S V S S I H V DELETED S S S V S S I H V E S S S V S S V Q A DELETED S S S V S S V Q A E S S S V S S V Q V DELETED S S S V S S V Q V E S S S V S S V H A DELETED S S S V S S V H A E S S S V S S V H V DELETED S S S V S S V H V E S S S V T Y I Q A DELETED S S S V T Y I Q A E S S S V T Y I Q V DELETED S S S V T Y I Q V E S S S V T Y I H A DELETED S S S V T Y I H A E S S S V T Y I H V DELETED S S S V T Y I H V E S S S V T Y V Q A DELETED S S S V T Y V Q A E S S S V T Y V Q V DELETED S S S V T Y V Q V E S S S V T Y V H A DELETED S S S V T Y V H A E S S S V T Y V H V DELETED S S S V T Y V H V E S S S V T S I Q A DELETED S S S V T S I Q A E S S S V T S I Q V DELETED S S S V T S I Q V E S S S V T S I H A DELETED S S S V T S I H A E S S S V T S I H V DELETED S S S V T S I H V E S S S V T S V Q A DELETED S S S V T S V Q A E S S S V T S V Q V DELETED S S S V T S V Q V E S S S V T S V H A DELETED S S S V T S V H A E S S S V T S V H V DELETED S S S V T S V H V E S S S I S Y I Q A DELETED S S S I S Y I Q A E S S S I S Y I Q V DELETED S S S I S Y I Q V E S S S I S Y I H A DELETED S S S I S Y I H A E S S S I S Y I H V DELETED S S S I S Y I H V E S S S I S Y V Q A DELETED S S S I S Y V Q A E S S S I S Y V Q V DELETED S S S I S Y V Q V E S S S I S Y V H A DELETED S S S I S Y V H A E S S S I S Y V H V DELETED S S S I S Y V H V E S S S I S S I Q A DELETED S S S I S S I Q A E S S S I S S I Q V DELETED S S S I S S I Q V E S S S I S S I H A DELETED S S S I S S I H A E S S S I S S I H V DELETED S S S I S S I H V E S S S I S S V Q A DELETED S S S I S S V Q A E S S S I S S V Q V DELETED S S S I S S V Q V E S S S I S S V H A DELETED S S S I S S V H A E S S S I S S V H V DELETED S S S I S S V H V E S S S I T Y I Q A DELETED S S S I T Y I Q A E S S S I T Y I Q V DELETED S S S I T Y I Q V E S S S I T Y I H A DELETED S S S I T Y I H A E S S S I T Y I H V DELETED S S S I T Y I H V E S S S I T Y V Q A DELETED S S S I T Y V Q A E S S S I T Y V Q V DELETED S S S I T Y V Q V E S S S I T Y V H A DELETED S S S I T Y V H A E S S S I T Y V H V DELETED S S S I T Y V H V E S S S I T S I Q A DELETED S S S I T S I Q A E S S S I T S I Q V DELETED S S S I T S I Q V E S S S I T S I H A DELETED S S S I T S I H A E S S S I T S I H V DELETED S S S I T S I H V E S S S I T S V Q A DELETED S S S I T S V Q A E S S S I T S V Q V DELETED S S S I T S V Q V E S S S I T S V H A DELETED S S S I T S V H A E S S S I T S V H V DELETED S S S I T S V H V E S S N V S Y I Q A DELETED S S N V S Y I Q A E S S N V S Y I Q V DELETED S S N V S Y I Q V E S S N V S Y I H A DELETED S S N V S Y I H A E S S N V S Y I H V DELETED S S N V S Y I H V E S S N V S Y V Q A DELETED S S N V S Y V Q A E S S N V S Y V Q V DELETED S S N V S Y V Q V E S S N V S Y V H A DELETED S S N V S Y V H A E S S N V S Y V H V DELETED S S N V S Y V H V E S S N V S S I Q A DELETED S S N V S S I Q A E S S N V S S I Q V DELETED S S N V S S I Q V E S S N V S S I H A DELETED S S N V S S I H A E S S N V S S I H V DELETED S S N V S S I H V E S S N V S S V Q A DELETED S S N V S S V Q A E S S N V S S V Q V DELETED S S N V S S V Q V E S S N V S S V H A DELETED S S N V S S V H A E S S N V S S V H V DELETED S S N V S S V H V E S S N V T Y I Q A DELETED S S N V T Y I Q A E S S N V T Y I Q V DELETED S S N V T Y I Q V E S S N V T Y I H A DELETED S S N V T Y I H A E S S N V T Y I H V DELETED S S N V T Y I H V E S S N V T Y V Q A DELETED S S N V T Y V Q A E S S N V T Y V Q V DELETED S S N V T Y V Q V E S S N V T Y V H A DELETED S S N V T Y V H A E S S N V T Y V H V DELETED S S N V T Y V H V E S S N V T S I Q A DELETED S S N V T S I Q A E S S N V T S I Q V DELETED S S N V T S I Q V E S S N V T S I H A DELETED S S N V T S I H A E S S N V T S I H V DELETED S S N V T S I H V E S S N V T S V Q A DELETED S S N V T S V Q A E S S N V T S V Q V DELETED S S N V T S V Q V E S S N V T S V H A DELETED S S N V T S V H A E S S N V T S V H V DELETED S S N V T S V H V E S S N I S Y I Q A DELETED S S N I S Y I Q A E S S N I S Y I Q V DELETED S S N I S Y I Q V E S S N I S Y I H A DELETED S S N I S Y I H A E S S N I S Y I H V DELETED S S N I S Y I H V E S S N I S Y V Q A DELETED S S N I S Y V Q A E S S N I S Y V Q V DELETED S S N I S Y V Q V E S S N I S Y V H A DELETED S S N I S Y V H A E S S N I S Y V H V DELETED S S N I S Y V H V E S S N I S S I Q A DELETED S S N I S S I Q A E S S N I S S I Q V DELETED S S N I S S I Q V E S S N I S S I H A DELETED S S N I S S I H A E S S N I S S I H V DELETED S S N I S S I H V E S S N I S S V Q A DELETED S S N I S S V Q A E S S N I S S V Q V DELETED S S N I S S V Q V E S S N I S S V H A DELETED S S N I S S V H A E S S N I S S V H V DELETED S S N I S S V H V E S S N I T Y I Q A DELETED S S N I T Y I Q A E S S N I T Y I Q V DELETED S S N I T Y I Q V E S S N I T Y I H A DELETED S S N I T Y I H A E S S N I T Y I H V DELETED S S N I T Y I H V E S S N I T Y V Q A DELETED S S N I T Y V Q A E S S N I T Y V Q V DELETED S S N I T Y V Q V E S S N I T Y V H A DELETED S S N I T Y V H A E S S N I T Y V H V DELETED S S N I T Y V H V E S S N I T S I Q A DELETED S S N I T S I Q A E S S N I T S I Q V DELETED S S N I T S I Q V E S S N I T S I H A DELETED S S N I T S I H A E S S N I T S I H V DELETED S S N I T S I H V E S S N I T S V Q A DELETED S S N I T S V Q A E S S N I T S V Q V DELETED S S N I T S V Q V E S S N I T S V H A DELETED S S N I T S V H A E S S N I T S V H V DELETED S S N I T S V H V E S T S V S Y I Q A DELETED S T S V S Y I Q A E S T S V S Y I Q V DELETED S T S V S Y I Q V E S T S V S Y I H A DELETED S T S V S Y I H A E S T S V S Y I H V DELETED S T S V S Y I H V E S T S V S Y V Q A DELETED S T S V S Y V Q A E S T S V S Y V Q V DELETED S T S V S Y V Q V E S T S V S Y V H A DELETED S T S V S Y V H A E S T S V S Y V H V DELETED S T S V S Y V H V E S T S V S S I Q A DELETED S T S V S S I Q A E S T S V S S I Q V DELETED S T S V S S I Q V E S T S V S S I H A DELETED S T S V S S I H A E S T S V S S I H V DELETED S T S V S S I H V E S T S V S S V Q A DELETED S T S V S S V Q A E S T S V S S V Q V DELETED S T S V S S V Q V E S T S V S S V H A DELETED S T S V S S V H A E S T S V S S V H V DELETED S T S V S S V H V E S T S V T Y I Q A DELETED S T S V T Y I Q A E S T S V T Y I Q V DELETED S T S V T Y I Q V E S T S V T Y I H A DELETED S T S V T Y I H A E S T S V T Y I H V DELETED S T S V T Y I H V E S T S V T Y V Q A DELETED S T S V T Y V Q A E S T S V T Y V Q V DELETED S T S V T Y V Q V E S T S V T Y V H A DELETED S T S V T Y V H A E S T S V T Y V H V DELETED S T S V T Y V H V E S T S V T S I Q A DELETED S T S V T S I Q A E S T S V T S I Q V DELETED S T S V T S I Q V E S T S V T S I H A DELETED S T S V T S I H A E S T S V T S I H V DELETED S T S V T S I H V E S T S V T S V Q A DELETED S T S V T S V Q A E S T S V T S V Q V DELETED S T S V T S V Q V E S T S V T S V H A DELETED S T S V T S V H A E S T S V T S V H V DELETED S T S V T S V H V E S T S I S Y I Q A DELETED S T S I S Y I Q A E S T S I S Y I Q V DELETED S T S I S Y I Q V E S T S I S Y I H A DELETED S T S I S Y I H A E S T S I S Y I H V DELETED S T S I S Y I H V E S T S I S Y V Q A DELETED S T S I S Y V Q A E S T S I S Y V Q V DELETED S T S I S Y V Q V E S T S I S Y V H A DELETED S T S I S Y V H A E S T S I S Y V H V DELETED S T S I S Y V H V E S T S I S S I Q A DELETED S T S I S S I Q A E S T S I S S I Q V DELETED S T S I S S I Q V E S T S I S S I H A DELETED S T S I S S I H A E S T S I S S I H V DELETED S T S I S S I H V E S T S I S S V Q A DELETED S T S I S S V Q A E S T S I S S V Q V DELETED S T S I S S V Q V E S T S I S S V H A DELETED S T S I S S V H A E S T S I S S V H V DELETED S T S I S S V H V E S T S I T Y I Q A DELETED S T S I T Y I Q A E S T S I T Y I Q V DELETED S T S I T Y I Q V E S T S I T Y I H A DELETED S T S I T Y I H A E S T S I T Y I H V DELETED S T S I T Y I H V E S T S I T Y V Q A DELETED S T S I T Y V Q A E S T S I T Y V Q V DELETED S T S I T Y V Q V E S T S I T Y V H A DELETED S T S I T Y V H A E S T S I T Y V H V DELETED S T S I T Y V H V E S T S I T S I Q A DELETED S T S I T S I Q A E S T S I T S I Q V DELETED S T S I T S I Q V E S T S I T S I H A DELETED S T S I T S I H A E S T S I T S I H V DELETED S T S I T S I H V E S T S I T S V Q A DELETED S T S I T S V Q A E S T S I T S V Q V DELETED S T S I T S V Q V E S T S I T S V H A DELETED S T S I T S V H A E S T S I T S V H V DELETED S T S I T S V H V E S T N V S Y I Q A DELETED S T N V S Y I Q A E S T N V S Y I Q V DELETED S T N V S Y I Q V E S T N V S Y I H A DELETED S T N V S Y I H A E S T N V S Y I H V DELETED S T N V S Y I H V E S T N V S Y V Q A DELETED S T N V S Y V Q A E S T N V S Y V Q V DELETED S T N V S Y V Q V E S T N V S Y V H A DELETED S T N V S Y V H A E S T N V S Y V H V DELETED S T N V S Y V H V E S T N V S S I Q A DELETED S T N V S S I Q A E S T N V S S I Q V DELETED S T N V S S I Q V E S T N V S S I H A DELETED S T N V S S I H A E S T N V S S I H V DELETED S T N V S S I H V E S T N V S S V Q A DELETED S T N V S S V Q A E S T N V S S V Q V DELETED S T N V S S V Q V E S T N V S S V H A DELETED S T N V S S V H A E S T N V S S V H V DELETED S T N V S S V H V E S T N V T Y I Q A DELETED S T N V T Y I Q A E S T N V T Y I Q V DELETED S T N V T Y I Q V E S T N V T Y I H A DELETED S T N V T Y I H A E S T N V T Y I H V DELETED S T N V T Y I H V E S T N V T Y V Q A DELETED S T N V T Y V Q A E S T N V T Y V Q V DELETED S T N V T Y V Q V E S T N V T Y V H A DELETED S T N V T Y V H A E S T N V T Y V H V DELETED S T N V T Y V H V E S T N V T S I Q A DELETED S T N V T S I Q A E S T N V T S I Q V DELETED S T N V T S I Q V E S T N V T S I H A DELETED S T N V T S I H A E S T N V T S I H V DELETED S T N V T S I H V E S T N V T S V Q A DELETED S T N V T S V Q A E S T N V T S V Q V DELETED S T N V T S V Q V E S T N V T S V H A DELETED S T N V T S V H A E S T N V T S V H V DELETED S T N V T S V H V E S T N I S Y I Q A DELETED S T N I S Y I Q A E S T N I S Y I Q V DELETED S T N I S Y I Q V E S T N I S Y I H A DELETED S T N I S Y I H A E S T N I S Y I H V DELETED S T N I S Y I H V E S T N I S Y V Q A DELETED S T N I S Y V Q A E S T N I S Y V Q V DELETED S T N I S Y V Q V E S T N I S Y V H A DELETED S T N I S Y V H A E S T N I S Y V H V DELETED S T N I S Y V H V E S T N I S S I Q A DELETED S T N I S S I Q A E S T N I S S I Q V DELETED S T N I S S I Q V E S T N I S S I H A DELETED S T N I S S I H A E S T N I S S I H V DELETED S T N I S S I H V E S T N I S S V Q A DELETED S T N I S S V Q A E S T N I S S V Q V DELETED S T N I S S V Q V E S T N I S S V H A DELETED S T N I S S V H A E S T N I S S V H V DELETED S T N I S S V H V E S T N I T Y I Q A DELETED S T N I T Y I Q A E S T N I T Y I Q V DELETED S T N I T Y I Q V E S T N I T Y I H A DELETED S T N I T Y I H A E S T N I T Y I H V DELETED S T N I T Y I H V E S T N I T Y V Q A DELETED S T N I T Y V Q A E S T N I T Y V Q V DELETED S T N I T Y V Q V E S T N I T Y V H A DELETED S T N I T Y V H A E S T N I T Y V H V DELETED S T N I T Y V H V E S T N I T S I Q A DELETED S T N I T S I Q A E S T N I T S I Q V DELETED S T N I T S I Q V E S T N I T S I H A DELETED S T N I T S I H A E S T N I T S I H V DELETED S T N I T S I H V E S T N I T S V Q A DELETED S T N I T S V Q A E S T N I T S V Q V DELETED S T N I T S V Q V E S T N I T S V H A DELETED S T N I T S V H A E S T N I T S V H V DELETED S T N I T S V H V E I S S V S Y I Q A DELETED I S S V S Y I Q A E I S S V S Y I Q V DELETED I S S V S Y I Q V E I S S V S Y I H A DELETED I S S V S Y I H A E I S S V S Y I H V DELETED I S S V S Y I H V E I S S V S Y V Q A DELETED I S S V S Y V Q A E I S S V S Y V Q V DELETED I S S V S Y V Q V E I S S V S Y V H A DELETED I S S V S Y V H A E I S S V S Y V H V DELETED I S S V S Y V H V E I S S V S S I Q A DELETED I S S V S S I Q A E I S S V S S I Q V DELETED I S S V S S I Q V E I S S V S S I H A DELETED I S S V S S I H A E I S S V S S I H V DELETED I S S V S S I H V E I S S V S S V Q A DELETED I S S V S S V Q A E I S S V S S V Q V DELETED I S S V S S V Q V E I S S V S S V H A DELETED I S S V S S V H A E I S S V S S V H V DELETED I S S V S S V H V E I S S V T Y I Q A DELETED I S S V T Y I Q A E I S S V T Y I Q V DELETED I S S V T Y I Q V E I S S V T Y I H A DELETED I S S V T Y I H A E I S S V T Y I H V DELETED I S S V T Y I H V E I S S V T Y V Q A DELETED I S S V T Y V Q A E I S S V T Y V Q V DELETED I S S V T Y V Q V E I S S V T Y V H A DELETED I S S V T Y V H A E I S S V T Y V H V DELETED I S S V T Y V H V E I S S V T S I Q A DELETED I S S V T S I Q A E I S S V T S I Q V DELETED I S S V T S I Q V E I S S V T S I H A DELETED I S S V T S I H A E I S S V T S I H V DELETED I S S V T S I H V E I S S V T S V Q A DELETED I S S V T S V Q A E I S S V T S V Q V DELETED I S S V T S V Q V E I S S V T S V H A DELETED I S S V T S V H A E I S S V T S V H V DELETED I S S V T S V H V E I S S I S Y I Q A DELETED I S S I S Y I Q A E I S S I S Y I Q V DELETED I S S I S Y I Q V E I S S I S Y I H A DELETED I S S I S Y I H A E I S S I S Y I H V DELETED I S S I S Y I H V E I S S I S Y V Q A DELETED I S S I S Y V Q A E I S S I S Y V Q V DELETED I S S I S Y V Q V E I S S I S Y V H A DELETED I S S I S Y V H A E I S S I S Y V H V DELETED I S S I S Y V H V E I S S I S S I Q A DELETED I S S I S S I Q A E I S S I S S I Q V DELETED I S S I S S I Q V E I S S I S S I H A DELETED I S S I S S I H A E I S S I S S I H V DELETED I S S I S S I H V E I S S I S S V Q A DELETED I S S I S S V Q A E I S S I S S V Q V DELETED I S S I S S V Q V E I S S I S S V H A DELETED I S S I S S V H A E I S S I S S V H V DELETED I S S I S S V H V E I S S I T Y I Q A DELETED I S S I T Y I Q A E I S S I T Y I Q V DELETED I S S I T Y I Q V E I S S I T Y I H A DELETED I S S I T Y I H A E I S S I T Y I H V DELETED I S S I T Y I H V E I S S I T Y V Q A DELETED I S S I T Y V Q A E I S S I T Y V Q V DELETED I S S I T Y V Q V E I S S I T Y V H A DELETED I S S I T Y V H A E I S S I T Y V H V DELETED I S S I T Y V H V E I S S I T S I Q A DELETED I S S I T S I Q A E I S S I T S I Q V DELETED I S S I T S I Q V E I S S I T S I H A DELETED I S S I T S I H A E I S S I T S I H V DELETED I S S I T S I H V E I S S I T S V Q A DELETED I S S I T S V Q A E I S S I T S V Q V DELETED I S S I T S V Q V E I S S I T S V H A DELETED I S S I T S V H A E I S S I T S V H V DELETED I S S I T S V H V E I S N V S Y I Q A DELETED I S N V S Y I Q A E I S N V S Y I Q V DELETED I S N V S Y I Q V E I S N V S Y I H A DELETED I S N V S Y I H A E I S N V S Y I H V DELETED I S N V S Y I H V E I S N V S Y V Q A DELETED I S N V S Y V Q A E I S N V S Y V Q V DELETED I S N V S Y V Q V E I S N V S Y V H A DELETED I S N V S Y V H A E I S N V S Y V H V DELETED I S N V S Y V H V E I S N V S S I Q A DELETED I S N V S S I Q A E I S N V S S I Q V DELETED I S N V S S I Q V E I S N V S S I H A DELETED I S N V S S I H A E I S N V S S I H V DELETED I S N V S S I H V E I S N V S S V Q A DELETED I S N V S S V Q A E I S N V S S V Q V DELETED I S N V S S V Q V E I S N V S S V H A DELETED I S N V S S V H A E I S N V S S V H V DELETED I S N V S S V H V E I S N V T Y I Q A DELETED I S N V T Y I Q A E I S N V T Y I Q V DELETED I S N V T Y I Q V E I S N V T Y I H A DELETED I S N V T Y I H A E I S N V T Y I H V DELETED I S N V T Y I H V E I S N V T Y V Q A DELETED I S N V T Y V Q A E I S N V T Y V Q V DELETED I S N V T Y V Q V E I S N V T Y V H A DELETED I S N V T Y V H A E I S N V T Y V H V DELETED I S N V T Y V H V E I S N V T S I Q A DELETED I S N V T S I Q A E I S N V T S I Q V DELETED I S N V T S I Q V E I S N V T S I H A DELETED I S N V T S I H A E I S N V T S I H V DELETED I S N V T S I H V E I S N V T S V Q A DELETED I S N V T S V Q A E I S N V T S V Q V DELETED I S N V T S V Q V E I S N V T S V H A DELETED I S N V T S V H A E I S N V T S V H V DELETED I S N V T S V H V E I S N I S Y I Q A DELETED I S N I S Y I Q A E I S N I S Y I Q V DELETED I S N I S Y I Q V E I S N I S Y I H A DELETED I S N I S Y I H A E I S N I S Y I H V DELETED I S N I S Y I H V E I S N I S Y V Q A DELETED I S N I S Y V Q A E I S N I S Y V Q V DELETED I S N I S Y V Q V E I S N I S Y V H A DELETED I S N I S Y V H A E I S N I S Y V H V DELETED I S N I S Y V H V E I S N I S S I Q A DELETED I S N I S S I Q A E I S N I S S I Q V DELETED I S N I S S I Q V E I S N I S S I H A DELETED I S N I S S I H A E I S N I S S I H V DELETED I S N I S S I H V E I S N I S S V Q A DELETED I S N I S S V Q A E I S N I S S V Q V DELETED I S N I S S V Q V E I S N I S S V H A DELETED I S N I S S V H A E I S N I S S V H V DELETED I S N I S S V H V E I S N I T Y I Q A DELETED I S N I T Y I Q A E I S N I T Y I Q V DELETED I S N I T Y I Q V E I S N I T Y I H A DELETED I S N I T Y I H A E I S N I T Y I H V DELETED I S N I T Y I H V E I S N I T Y V Q A DELETED I S N I T Y V Q A E I S N I T Y V Q V DELETED I S N I T Y V Q V E I S N I T Y V H A DELETED I S N I T Y V H A E I S N I T Y V H V DELETED I S N I T Y V H V E I S N I T S I Q A DELETED I S N I T S I Q A E I S N I T S I Q V DELETED I S N I T S I Q V E I S N I T S I H A DELETED I S N I T S I H A E I S N I T S I H V DELETED I S N I T S I H V E I S N I T S V Q A DELETED I S N I T S V Q A E I S N I T S V Q V DELETED I S N I T S V Q V E I S N I T S V H A DELETED I S N I T S V H A E I S N I T S V H V DELETED I S N I T S V H V E I T S V S Y I Q A DELETED I T S V S Y I Q A E I T S V S Y I Q V DELETED I T S V S Y I Q V E I T S V S Y I H A DELETED I T S V S Y I H A E I T S V S Y I H V DELETED I T S V S Y I H V E I T S V S Y V Q A DELETED I T S V S Y V Q A E I T S V S Y V Q V DELETED I T S V S Y V Q V E I T S V S Y V H A DELETED I T S V S Y V H A E I T S V S Y V H V DELETED I T S V S Y V H V E I T S V S S I Q A DELETED I T S V S S I Q A E I T S V S S I Q V DELETED I T S V S S I Q V E I T S V S S I H A DELETED I T S V S S I H A E I T S V S S I H V DELETED I T S V S S I H V E I T S V S S V Q A DELETED I T S V S S V Q A E I T S V S S V Q V DELETED I T S V S S V Q V E I T S V S S V H A DELETED I T S V S S V H A E I T S V S S V H V DELETED I T S V S S V H V E I T S V T Y I Q A DELETED I T S V T Y I Q A E I T S V T Y I Q V DELETED I T S V T Y I Q V E I T S V T Y I H A DELETED I T S V T Y I H A E I T S V T Y I H V DELETED I T S V T Y I H V E I T S V T Y V Q A DELETED I T S V T Y V Q A E I T S V T Y V Q V DELETED I T S V T Y V Q V E I T S V T Y V H A DELETED I T S V T Y V H A E I T S V T Y V H V DELETED I T S V T Y V H V E I T S V T S I Q A DELETED I T S V T S I Q A E I T S V T S I Q V DELETED I T S V T S I Q V E I T S V T S I H A DELETED I T S V T S I H A E I T S V T S I H V DELETED I T S V T S I H V E I T S V T S V Q A DELETED I T S V T S V Q A E I T S V T S V Q V DELETED I T S V T S V Q V E I T S V T S V H A DELETED I T S V T S V H A E I T S V T S V H V DELETED I T S V T S V H V E I T S I S Y I Q A DELETED I T S I S Y I Q A E I T S I S Y I Q V DELETED I T S I S Y I Q V E I T S I S Y I H A DELETED I T S I S Y I H A E I T S I S Y I H V DELETED I T S I S Y I H V E I T S I S Y V Q A DELETED I T S I S Y V Q A E I T S I S Y V Q V DELETED I T S I S Y V Q V E I T S I S Y V H A DELETED I T S I S Y V H A E I T S I S Y V H V DELETED I T S I S Y V H V E I T S I S S I Q A DELETED I T S I S S I Q A E I T S I S S I Q V DELETED I T S I S S I Q V E I T S I S S I H A DELETED I T S I S S I H A E I T S I S S I H V DELETED I T S I S S I H V E I T S I S S V Q A DELETED I T S I S S V Q A E I T S I S S V Q V DELETED I T S I S S V Q V E I T S I S S V H A DELETED I T S I S S V H A E I T S I S S V H V DELETED I T S I S S V H V E I T S I T Y I Q A DELETED I T S I T Y I Q A E I T S I T Y I Q V DELETED I T S I T Y I Q V E I T S I T Y I H A DELETED I T S I T Y I H A E I T S I T Y I H V DELETED I T S I T Y I H V E I T S I T Y V Q A DELETED I T S I T Y V Q A E I T S I T Y V Q V DELETED I T S I T Y V Q V E I T S I T Y V H A DELETED I T S I T Y V H A E I T S I T Y V H V DELETED I T S I T Y V H V E I T S I T S I Q A DELETED I T S I T S I Q A E I T S I T S I Q V DELETED I T S I T S I Q V E I T S I T S I H A DELETED I T S I T S I H A E I T S I T S I H V DELETED I T S I T S I H V E I T S I T S V Q A DELETED I T S I T S V Q A E I T S I T S V Q V DELETED I T S I T S V Q V E I T S I T S V H A DELETED I T S I T S V H A E I T S I T S V H V DELETED I T S I T S V H V E I T N V S Y I Q A DELETED I T N V S Y I Q A E I T N V S Y I Q V DELETED I T N V S Y I Q V E I T N V S Y I H A DELETED I T N V S Y I H A E I T N V S Y I H V DELETED I T N V S Y I H V E I T N V S Y V Q A DELETED I T N V S Y V Q A E I T N V S Y V Q V DELETED I T N V S Y V Q V E I T N V S Y V H A DELETED I T N V S Y V H A E I T N V S Y V H V DELETED I T N V S Y V H V E I T N V S S I Q A DELETED I T N V S S I Q A E I T N V S S I Q V DELETED I T N V S S I Q V E I T N V S S I H A DELETED I T N V S S I H A E I T N V S S I H V DELETED I T N V S S I H V E I T N V S S V Q A DELETED I T N V S S V Q A E I T N V S S V Q V DELETED I T N V S S V Q V E I T N V S S V H A DELETED I T N V S S V H A E I T N V S S V H V DELETED I T N V S S V H V E I T N V T Y I Q A DELETED I T N V T Y I Q A E I T N V T Y I Q V DELETED I T N V T Y I Q V E I T N V T Y I H A DELETED I T N V T Y I H A E I T N V T Y I H V DELETED I T N V T Y I H V E I T N V T Y V Q A DELETED I T N V T Y V Q A E I T N V T Y V Q V DELETED I T N V T Y V Q V E I T N V T Y V H A DELETED I T N V T Y V H A E I T N V T Y V H V DELETED I T N V T Y V H V E I T N V T S I Q A DELETED I T N V T S I Q A E I T N V T S I Q V DELETED I T N V T S I Q V E I T N V T S I H A DELETED I T N V T S I H A E I T N V T S I H V DELETED I T N V T S I H V E I T N V T S V Q A DELETED I T N V T S V Q A E I T N V T S V Q V DELETED I T N V T S V Q V E I T N V T S V H A DELETED I T N V T S V H A E I T N V T S V H V DELETED I T N V T S V H V E I T N I S Y I Q A DELETED I T N I S Y I Q A E I T N I S Y I Q V DELETED I T N I S Y I Q V E I T N I S Y I H A DELETED I T N I S Y I H A E I T N I S Y I H V DELETED I T N I S Y I H V E I T N I S Y V Q A DELETED I T N I S Y V Q A E I T N I S Y V Q V DELETED I T N I S Y V Q V E I T N I S Y V H A DELETED I T N I S Y V H A E I T N I S Y V H V DELETED I T N I S Y V H V E I T N I S S I Q A DELETED I T N I S S I Q A E I T N I S S I Q V DELETED I T N I S S I Q V E I T N I S S I H A DELETED I T N I S S I H A E I T N I S S I H V DELETED I T N I S S I H V E I T N I S S V Q A DELETED I T N I S S V Q A E I T N I S S V Q V DELETED I T N I S S V Q V E I T N I S S V H A DELETED I T N I S S V H A E I T N I S S V H V DELETED I T N I S S V H V E I T N I T Y I Q A DELETED I T N I T Y I Q A E I T N I T Y I Q V DELETED I T N I T Y I Q V E I T N I T Y I H A DELETED I T N I T Y I H A E I T N I T Y I H V DELETED I T N I T Y I H V E I T N I T Y V Q A DELETED I T N I T Y V Q A E I T N I T Y V Q V DELETED I T N I T Y V Q V E I T N I T Y V H A DELETED I T N I T Y V H A E I T N I T Y V H V DELETED I T N I T Y V H V E I T N I T S I Q A DELETED I T N I T S I Q A E I T N I T S I Q V DELETED I T N I T S I Q V E I T N I T S I H A DELETED I T N I T S I H A E I T N I T S I H V DELETED I T N I T S I H V E I T N I T S V Q A DELETED I T N I T S V Q A E I T N I T S V Q V DELETED I T N I T S V Q V E I T N I T S V H A DELETED I T N I T S V H A E I T N I T S V H V DELETED I T N I T S V H V E

TABLE 16 Exemplary Mutations of mAb 4.18.1 Light Chain (SEQ ID NO: 52) to Germline at the Indicated Residue Number. 7 13 32 39 55 58 65 92 S V N K A I S N S V N K A I S G S V N K A I I N S V N K A I I G S V N K A F S N S V N K A F S G S V N K A F I N S V N K A F I G S V N K S I S N S V N K S I S G S V N K S I I N S V N K S I I G S V N K S F S N S V N K S F S G S V N K S F I N S V N K S F I G S V N T A I S N S V N T A I S G S V N T A I I N S V N T A I I G S V N T A F S N S V N T A F S G S V N T A F I N S V N T A F I G S V N T S I S N S V N T S I S G S V N T S I I N S V N T S I I G S V N T S F S N S V N T S F S G S V N T S F I N S V N T S F I G S V S K A I S N S V S K A I S G S V S K A I I N S V S K A I I G S V S K A F S N S V S K A F S G S V S K A F I N S V S K A F I G S V S K S I S N S V S K S I S G S V S K S I I N S V S K S I I G S V S K S F S N S V S K S F S G S V S K S F I N S V S K S F I G S V S T A I S N S V S T A I S G S V S T A I I N S V S T A I I G S V S T A F S N S V S T A F S G S V S T A F I N S V S T A F I G S V S T S I S N S V S T S I S G S V S T S I I N S V S T S I I G S V S T S F S N S V S T S F S G S V S T S F I N S V S T S F I G S M N K A I S N S M N K A I S G S M N K A I I N S M N K A I I G S M N K A F S N S M N K A F S G S M N K A F I N S M N K A F I G S M N K S I S N S M N K S I S G S M N K S I I N S M N K S I I G S M N K S F S N S M N K S F S G S M N K S F I N S M N K S F I G S M N T A I S N S M N T A I S G S M N T A I I N S M N T A I I G S M N T A F S N S M N T A F S G S M N T A F I N S M N T A F I G S M N T S I S N S M N T S I S G S M N T S I I N S M N T S I I G S M N T S F S N S M N T S F S G S M N T S F I N S M N T S F I G S M S K A I S N S M S K A I S G S M S K A I I N S M S K A I I G S M S K A F S N S M S K A F S G S M S K A F I N S M S K A F I G S M S K S I S N S M S K S I S G S M S K S I I N S M S K S I I G S M S K S F S N S M S K S F S G S M S K S F I N S M S K S F I G S M S T A I S N S M S T A I S G S M S T A I I N S M S T A I I G S M S T A F S N S M S T A F S G S M S T A F I N S M S T A F I G S M S T S I S N S M S T S I S G S M S T S I I N S M S T S I I G S M S T S F S N S M S T S F S G S M S T S F I N S M S T S F I G F V N K A I S N F V N K A I S G F V N K A I I N F V N K A I I G F V N K A F S N F V N K A F S G F V N K A F I N F V N K A F I G F V N K S I S N F V N K S I S G F V N K S I I N F V N K S I I G F V N K S F S N F V N K S F S G F V N K S F I N F V N K S F I G F V N T A I S N F V N T A I S G F V N T A I I N F V N T A I I G F V N T A F S N F V N T A F S G F V N T A F I N F V N T A F I G F V N T S I S N F V N T S I S G F V N T S I I N F V N T S I I G F V N T S F S N F V N T S F S G F V N T S F I N F V N T S F I G F V S K A I S N F V S K A I S G F V S K A I I N F V S K A I I G F V S K A F S N F V S K A F S G F V S K A F I N F V S K A F I G F V S K S I S N F V S K S I S G F V S K S I I N F V S K S I I G F V S K S F S N F V S K S F S G F V S K S F I N F V S K S F I G F V S T A I S N F V S T A I S G F V S T A I I N F V S T A I I G F V S T A F S N F V S T A F S G F V S T A F I N F V S T A F I G F V S T S I S N F V S T S I S G F V S T S I I N F V S T S I I G F V S T S F S N F V S T S F S G F V S T S F I N F V S T S F I G F M N K A I S N F M N K A I S G F M N K A I I N F M N K A I I G F M N K A F S N F M N K A F S G F M N K A F I N F M N K A F I G F M N K S I S N F M N K S I S G F M N K S I I N F M N K S I I G F M N K S F S N F M N K S F S G F M N K S F I N F M N K S F I G F M N T A I S N F M N T A I S G F M N T A I I N F M N T A I I G F M N T A F S N F M N T A F S G F M N T A F I N F M N T A F I G F M N T S I S N F M N T S I S G F M N T S I I N F M N T S I I G F M N T S F S N F M N T S F S G F M N T S F I N F M N T S F I G F M S K A I S N F M S K A I S G F M S K A I I N F M S K A I I G F M S K A F S N F M S K A F S G F M S K A F I N F M S K A F I G F M S K S I S N F M S K S I S G F M S K S I I N F M S K S I I G F M S K S F S N F M S K S F S G F M S K S F I N F M S K S F I G F M S T A I S N F M S T A I S G F M S T A I I N F M S T A I I G F M S T A F S N F M S T A F S G F M S T A F I N F M S T A F I G F M S T S I S N F M S T S I S G F M S T S I I N F M S T S I I G F M S T S F S N F M S T S F S G F M S T S F I N F M S T S F I G

TABLE 17 Exemplary Mutations of mAb 4.18.1 Heavy Chain (SEQ ID NO: 50) to Germline at the Indicated Residue Number. 30 31 35 53 75 98-99 103 117 S S S S K EG G S S S S S K EG G L S S S S K EG DELETED S S S S S K EG DELETED L S S S S K DELETED G S S S S S K DELETED G L S S S S K DELETED DELETED S S S S S K DELETED DELETED L S S S S R EG G S S S S S R EG G L S S S S R EG DELETED S S S S S R EG DELETED L S S S S R DELETED G S S S S S R DELETED G L S S S S R DELETED DELETED S S S S S R DELETED DELETED L S S S T K EG G S S S S T K EG G L S S S T K EG DELETED S S S S T K EG DELETED L S S S T K DELETED G S S S S T K DELETED G L S S S T K DELETED DELETED S S S S T K DELETED DELETED L S S S T R EG G S S S S T R EG G L S S S T R EG DELETED S S S S T R EG DELETED L S S S T R DELETED G S S S S T R DELETED G L S S S T R DELETED DELETED S S S S T R DELETED DELETED L S S N S K EG G S S S N S K EG G L S S N S K EG DELETED S S S N S K EG DELETED L S S N S K DELETED G S S S N S K DELETED G L S S N S K DELETED DELETED S S S N S K DELETED DELETED L S S N S R EG G S S S N S R EG G L S S N S R EG DELETED S S S N S R EG DELETED L S S N S R DELETED G S S S N S R DELETED G L S S N S R DELETED DELETED S S S N S R DELETED DELETED L S S N T K EG G S S S N T K EG G L S S N T K EG DELETED S S S N T K EG DELETED L S S N T K DELETED G S S S N T K DELETED G L S S N T K DELETED DELETED S S S N T K DELETED DELETED L S S N T R EG G S S S N T R EG G L S S N T R EG DELETED S S S N T R EG DELETED L S S N T R DELETED G S S S N T R DELETED G L S S N T R DELETED DELETED S S S N T R DELETED DELETED L S N S S K EG G S S N S S K EG G L S N S S K EG DELETED S S N S S K EG DELETED L S N S S K DELETED G S S N S S K DELETED G L S N S S K DELETED DELETED S S N S S K DELETED DELETED L S N S S R EG G S S N S S R EG G L S N S S R EG DELETED S S N S S R EG DELETED L S N S S R DELETED G S S N S S R DELETED G L S N S S R DELETED DELETED S S N S S R DELETED DELETED L S N S T K EG G S S N S T K EG G L S N S T K EG DELETED S S N S T K EG DELETED L S N S T K DELETED G S S N S T K DELETED G L S N S T K DELETED DELETED S S N S T K DELETED DELETED L S N S T R EG G S S N S T R EG G L S N S T R EG DELETED S S N S T R EG DELETED L S N S T R DELETED G S S N S T R DELETED G L S N S T R DELETED DELETED S S N S T R DELETED DELETED L S N N S K EG G S S N N S K EG G L S N N S K EG DELETED S S N N S K EG DELETED L S N N S K DELETED G S S N N S K DELETED G L S N N S K DELETED DELETED S S N N S K DELETED DELETED L S N N S R EG G S S N N S R EG G L S N N S R EG DELETED S S N N S R EG DELETED L S N N S R DELETED G S S N N S R DELETED G L S N N S R DELETED DELETED S S N N S R DELETED DELETED L S N N T K EG G S S N N T K EG G L S N N T K EG DELETED S S N N T K EG DELETED L S N N T K DELETED G S S N N T K DELETED G L S N N T K DELETED DELETED S S N N T K DELETED DELETED L S N N T R EG G S S N N T R EG G L S N N T R EG DELETED S S N N T R EG DELETED L S N N T R DELETED G S S N N T R DELETED G L S N N T R DELETED DELETED S S N N T R DELETED DELETED L R S S S K EG G S R S S S K EG G L R S S S K EG DELETED S R S S S K EG DELETED L R S S S K DELETED G S R S S S K DELETED G L R S S S K DELETED DELETED S R S S S K DELETED DELETED L R S S S R EG G S R S S S R EG G L R S S S R EG DELETED S R S S S R EG DELETED L R S S S R DELETED G S R S S S R DELETED G L R S S S R DELETED DELETED S R S S S R DELETED DELETED L R S S T K EG G S R S S T K EG G L R S S T K EG DELETED S R S S T K EG DELETED L R S S T K DELETED G S R S S T K DELETED G L R S S T K DELETED DELETED S R S S T K DELETED DELETED L R S S T R EG G S R S S T R EG G L R S S T R EG DELETED S R S S T R EG DELETED L R S S T R DELETED G S R S S T R DELETED G L R S S T R DELETED DELETED S R S S T R DELETED DELETED L R S N S K EG G S R S N S K EG G L R S N S K EG DELETED S R S N S K EG DELETED L R S N S K DELETED G S R S N S K DELETED G L R S N S K DELETED DELETED S R S N S K DELETED DELETED L R S N S R EG G S R S N S R EG G L R S N S R EG DELETED S R S N S R EG DELETED L R S N S R DELETED G S R S N S R DELETED G L R S N S R DELETED DELETED S R S N S R DELETED DELETED L R S N T K EG G S R S N T K EG G L R S N T K EG DELETED S R S N T K EG DELETED L R S N T K DELETED G S R S N T K DELETED G L R S N T K DELETED DELETED S R S N T K DELETED DELETED L R S N T R EG G S R S N T R EG G L R S N T R EG DELETED S R S N T R EG DELETED L R S N T R DELETED G S R S N T R DELETED G L R S N T R DELETED DELETED S R S N T R DELETED DELETED L R N S S K EG G S R N S S K EG G L R N S S K EG DELETED S R N S S K EG DELETED L R N S S K DELETED G S R N S S K DELETED G L R N S S K DELETED DELETED S R N S S K DELETED DELETED L R N S S R EG G S R N S S R EG G L R N S S R EG DELETED S R N S S R EG DELETED L R N S S R DELETED G S R N S S R DELETED G L R N S S R DELETED DELETED S R N S S R DELETED DELETED L R N S T K EG G S R N S T K EG G L R N S T K EG DELETED S R N S T K EG DELETED L R N S T K DELETED G S R N S T K DELETED G L R N S T K DELETED DELETED S R N S T K DELETED DELETED L R N S T R EG G S R N S T R EG G L R N S T R EG DELETED S R N S T R EG DELETED L R N S T R DELETED G S R N S T R DELETED G L R N S T R DELETED DELETED S R N S T R DELETED DELETED L R N N S K EG G S R N N S K EG G L R N N S K EG DELETED S R N N S K EG DELETED L R N N S K DELETED G S R N N S K DELETED G L R N N S K DELETED DELETED S R N N S K DELETED DELETED L R N N S R EG G S R N N S R EG G L R N N S R EG DELETED S R N N S R EG DELETED L R N N S R DELETED G S R N N S R DELETED G L R N N S R DELETED DELETED S R N N S R DELETED DELETED L R N N T K EG G S R N N T K EG G L R N N T K EG DELETED S R N N T K EG DELETED L R N N T K DELETED G S R N N T K DELETED G L R N N T K DELETED DELETED S R N N T K DELETED DELETED L R N N T R EG G S R N N T R EG G L R N N T R EG DELETED S R N N T R EG DELETED L R N N T R DELETED G S R N N T R DELETED G L R N N T R DELETED DELETED S R N N T R DELETED DELETED L

TABLE 18 Heavy chain analysis SEQ Chain ID Name NO: V D J FR1 CDR1 FR2 CDR2 FR3 CDR3 FR4 70 Germline EVQLVESGGGL SYDMH WVRQATG AIGTAGDT RFTISRENAKNSLYLQ DYSNYTM WGQGTT VQPGGSLRLSC KGLEWVS YYPGSVKG MNSLRAGDTAVYYYAR VRGVYGM VTVSS AASGFTFS DV 1.4.2g2 2 VH3-13 D3-10 JH6B EVQLVESGGGL SYDMH WVRQATG AIGTAGDT RFTISRENAKNSLYLQ EGDYSNY WGQGTT VQPGGSLRLSC KGLEWVS YYPGSVKG MNSLRAGDTAVYYCAR FTMVRGV VTVSS AASGFTFS TYGMDV 1.61.1g2 10 VH3-13 D3-10 JH6B EVQLVESGGGL SYDMH WVRQATG AIGTAGDT RFTISRENAKNSLYLQ EGDYSNY WGQGTT VQPGGSLRLSC KGLEWVS YYPGSVKG MNSLRAGDTAVYYCAR FTRVRGV VTVSS AASGFTFS TYGMDV 71 Germline EVQLLESGGGL SYAMS WVRQAPG AISGSGGS RFTISRDNSKNTLYLQ YGDYWYF WGRGTL VQPGGSLRLSC KGLEWVS TYYADSVK MNSLRAEDTAVYYCAK DL VTVSS AASGFTFS G 4.13.1g4 46 VH3-23 D4-17 JH2 EVQLLESGGGL SYAMS WVRQAPG GISGSGGS RFTISRDNSKNTLYLQ DGYGDYV WGRGTL VQPGGSLRLSC KGLEWVL TYYADSVK MNSLRAEDTAVYYCAK GWYFDL VTVSS AASGFTFS G 72 Germline QVQLVESGGGV SYGMH WVRQAPG VIWYDGSN RFTISRDNSKNTLYLQ DMIVVVI WGQGTM VQPGRSLRLSC KGLEWVA KYYADSVK MNSLRAEDTAVYYCAR TAFDI VTVSS AASGFTFS G 4.50.1g4 58 VH3-33 D3-22 JH3B QVQLVESGGGV SYGMH WVRQAPG VIWYDGSN RFTISRDNSKNTLYLQ DMIVVVI WGQGTM VQPGRSLRLSC KGLEWVA KDYADSVK MNSLRAEDTAVYYCAR TYAFDI VTVSS AASGFTFS G 73 Germline QVQLVESGGGV SYGMH WVRQAPG VIWYDGSN RFTISRDNSKNTLYLQ YYYYYGM WGQGTT VQPGRSLRLSC KGLEWVA KYYADSVK MNSLRAEDTAVYYCAR DV VTVSS AASGFTFS G 1.41.1g2 6 VH3-33 D6-6 JH6B QVQLVESGGGV SYGMH WVRQAPG VIWYDGSQ RFTISRDNSKNTLYLQ GMTYYYY WGQGTT VQPGRSLRLSC KGLEWVA KYYADSVK MNSLRAEDTAVYYCAR YGMDV VTVSS AAPGFTFS G 1.113. 22 VH3-33 D6-6 JH6B QVQLVESGGGV SYGMH WVRQAPG VIWYDGSN RFTISRDNSKNTLYLQ DLAALYY WGQGTT 2g2 VQPGRSLRLSC KGLEWVA KYYADSVK MNSLRAEDTAVYYCAR YYGMHV VTVSS AASGFTFS G 74 Germline EVQLVESGGGL SNYMS WVRQAPG VIYSGGST RFTISRDNSKNTLYLQ AVAFDY WGQGTL IQPGGSLRLSC KGLEWVS YYADSVKG MNSLRAEDTAVYYCAR VTVSS AASGFTVS 1.99.1g2 14 VH3-53 D6-19 JH4B EVQLVESGGGL SNYMS WVRQAPG VIYTGGST RFSISRDNSKNTLYLQ EGAVAGF WGQGTL IQPGGSLRLSC KGLEWIS YYADSVKG MNSLRAEDTAVYYCAR DY VTVSS AASGFTVR 4.18.1g4 50 VH3-53 D6-19 JH4B EVQLVESGGGL NNYMN WVRQAPG VIYTGGST RFTISRDNSRNTLYLQ EGAVAGF WGQGTL IQPGGSLRLSC KGLEWVS YYADSVKG MNSLRAEDTAVYYCAR DY VTVSL AASGFTVR 75 Germline EVQLVESGGGL SNYMS WVRQAPG VIYSGGST RFTISRDNSKNTLYLQ YYYYYGM WGQGTT IQPGGSINLSC KGLEWVS YYADSVKG MNSLRAEDTAVYYCAR DV VTVSS AASGFTVS 1.100. 18 VH3-53 JH6B EVQLVESGGGL NNYMN WVRQAPG VIYTGGST RFTISRDNSKNTLYLQ EGKLAGM WGQGTT 1g2 LQPGGSLRLSC KGLEWVS YYADSVKG MNSLRAEDTAVYYCAR DV VTVSS AASGFTVR 4.19.1g4 54 VH3-53 JH6B EVQLVESGGGL SNYMN WVRQAPG VIYTGGST RFTISRDNSKNTLYLQ DTYLYGM WGQGTT IQPGGSLRLSC KGLEWVS YYADSVKG MNSLRAEDTAVYYCAR DV VTVSS AASGFSVS 76 Germline EVQLVESGGGL SYWMS WVRQAPG NIKQDGSE RFTISRDNAKNSLYLQ GWYWYFD WGRGTL VQPGGSLRLSC KGLEWVA KYYVDSVK MNSLRAEDTAVYYCAR L VTVSS AASGFTFS G 4.12.1g4 42 VH3-7 D6-19 JH2 EVQLVESGGGL SYWMS WVRQAPG NINGDGSE RFTISRDNAKNSPHLQ EGSGGRY WGRGTL VQPGGSLRLSC TGLDWVA RYYVDSVK MNSLRAEDTAVYYCAR GGWYFDL VTVSS AASGFTFS G 77 Germline QVQLVESGGGV SYGMH WVRQAPG VIWYDGSN RFTISRDNSKNTLYLQ HIVVVTA WGQGTL VQPGRSLRLSC KGLEWVA KYYADSVK MNSLRAEDTAVYYCAR ILDY VTVSS AASGFTFS G 2.19.2g2 30 VH3-33 D2-21 JH4B QVQLVESGGGV SYGMH WVRQAPG VIWYDGSN RFTISRDNSKNTLYLQ DQHIVVV WGQGTL VQPGRSLRLSC KGLEWVA KYYADSVK MNSLRAEDTAVYYCAR TAILDY VTVSS AASGFTFS G 78 Germline EVQLVESGGGL SNYMS WVRQAPG VIYSGGST RFTISRDNSKNTLYLQ IAVAGYY WGQGTT IQPGGSLRLSC KGLEWVS YYADSVKG MNSLRAEDTAVYYCAR GMDV VTVS AASGFTVS 2.6.1g2 26 VH3-53 D6-19 JH6B EVQLVESGGGL TNYMN WVRQAPG IIYTGGST RFTVSRDNSKNTLYLH EIAVAGY WGQGTT IQPGGSLRLSC KGLEWVS SYADSVKG MNSLRVEDTAVYYCAR YGMDV VTVS AASGFTVI 79 Germline EVQLVESGGGL SYWMS WVRQAPG NIKQDGSE RFTISRDNAKNSLYLQ YYYDSSG WGRGTL VQPGGSLRLSC KGLEWVA KYYVDSVK MNSLRAEDTAVYYCAR YYWFDL VTVSS AASGFTFS G 3.8.3g2 34 VH3-7 D3-22 JH2 EVQLVESGGGL SYWMS WVRQAPG NIKQHGSB RFTISRDNAXWSLYLQ EEAYYYD WARGTL VQPGGSLRLSC KGLEWVA KYYVDSVK MNSLRAEDTAVYYCAR NSGYYWY VTVSS AASGFTFS G FDL 80 Germline QVQLQESGPGL SGGYY WIRGHPG YIYYSGST RVTISVDTSXNQFSLK YYYYYGM WGQGTT VKPSQTLSLTC WS KGLEWIG YYNPSLKS LSSVTAADTAVYYCAR DV VTVSS TVSGGSIS 3.176. 38 VH4-31 D2-21 JH6B  QVQLQESGPGL SGGHY WIRQHPG YIYYSGRT RVTISVDTSKNQFSLK DGTGDYY WGQGTT 2g2 VKPSQTLSLTC WS KGLEWIG YYNPSLKS LSSVTAADTAVYYCAR YYGMDV VTVSS TVSGGSIS

TABLE 19 Light chain analysis SEQ Chain ID Name NO: V J FR1 CDR1 FR2 CDR2 FR3 CDR3 FR4 61 Germline DIVMTQSPDSLA KSSQSVLYS WYQQKPGQ WAST GVPDRFSGSGSGTDFT QQYYS FGQGTK VSLGERATINC SNNKNYLA PPKLLIY RES LTISSLQAEDVAVYYC TPPT VEIK 4.13.1k 48 B3 JK1 DIVMTQSPDSLA KSSQSVLYS WYQQKPGQ WAST GVPDRFSGSGSGTDFT QQFYS FGQGTK VSLGERATINC SNNKNFLA PPKLLIY RES LTISNLQAEDVAVYYC TPPT VEIR 4.50.1k 60 B3 JK1 DIVMTQSPDSLA KSSQSVLYS WYQQKPGQ WAST GVPDRFSGSGSGTDFT QQYYR FGQGTR VSLGERATINC SNNKNYLA PPKLLIY RES LTISSLQAEDVAVYYC TPPT VEIK 2.19.2k 32 B3 JK1 DIVMTQSPDSLS KSSQSVLYG WYQQKPGQ WAST GVPDRFSGSGSGTDFT QQYYS FGQGTK VSLGERATINC SNNRNSLA PPKLLIY RES LTISSLQAEDVAVYYC IFPWT VEIK 62 Germline DIVMTQSPDSLA KSSQSVLYS WYQQKPGQ WAST GVPDRFSGSGSGTDFT QQYYS FGQGTR VSLGERATINC SNNKNYLA PPKLLIY RES LTISSLQAEDVAVYYC TPPIT LEIK 4.12.1k 44 B3 JK5 DIVMTQSPDSLA KSSQSVLYS WYQQKPGQ WAST GVPDRFSGSGSGTDFT QQYYS FGQGTR VSLGERATINC SNNKNFLA PPKLLIY RES LTISSLQAEDVAVYYC TPPIT LEIK 63 Germline DIQMTQSPSSLS RASQGISNY WFQQKPGK AASS GVPSRFSGSGSGTDFT QQYNS FGGGTK ASVGDRVTITC LA APKSLIY LQS LTISSLQPEDFATYYC YPLT VEIK 1.4.2k  4 L1 JK4 DIQLTQSPSSLC RASQGISKY WFQQKPGK GASS GVPAKFSGSGSGTDFT QQYNS FGGGTK ASVGDRITITC LA APKSLIY LQS LTISSLQPEDFATYYC YPLT VEIK 1.61.1k 12 L1 JK4 DIQMTQSPSSLS RASQGISKY WFQQKPGK GASS GVPSKFSGSGSGTDFT QQYNS FGGGTK ASVGDRVTITC LA APKSLIY LQS LTISSLQPEDFATYYC YPLT VEIK 64 Germline EIVMTQSPATLS RASQSVSSN WYQQKPGQ GAST GIPARFSGSGSGTEFT QQYNN FGQGTK VSPGERATLSC LA APRLLIY RAT LTISSLQSEDFAVYYC WPRT VEIK 1.113.2k 24 L2 JK1 EIVMTQSPATLS RASQSFSSN WYQQKPGQ GAST GIPARFSGSGSGTEFT QQNNN FGQGTK VSPGERATLSC LA APRLLIY RAT LTISSLQSEDFAVYYC WPRT VEIK 1.41.1k  8 L2 JK1 EIVMTQSPAILS RASQSVSSK WYQQKPGQ GAST GIPARFSGSGSGTEFT QQYNN FGQGTK VSPGERATLSC LD APRLLIY RAT LTISSLQSEDFAVYYC WPRT VEIK 65 Germline EIVMTQSPATLS RASQSVSSN WYQQKPGQ GAST GIPARFSGSGSGTEFT QQYNN FGGGTK VSPGERATLSC LA APRLLIY RAT LTISSLQSEDFAVYYC WPLT VEIK 1.99.1k 16 L2 JK4 EIVMTQSPATLS RASQSISSN WYQQKPGQ GAST GIPARFSGSGSGTEFT QQYNN FGGGTK VSPGERATLSC LA APRLLIY RAT LTISSLQSEDFAVYYC WPLT VEIK 4.19.1k 56 L2 JK4 EIVMTQSPATLS RTSQSVSSN WYQQKPGQ GASA GVPARFSGSGSGTEFT QQYYN FGGGTK VSPGESATLSC LA TPRLLIY RAT LTISSLQSEDFAVYYC WPLT VEIK 1.100.1k 20 L2 JK4 ETVMTQSPATLS RASQSVSSN WYQQKPGQ GAST GIPARFSGSGSGTEFT QQYNN FGGGTK VSPGERATLSC LA APRLLIY RAT LTISSLQSEEFAVYYC WPLT VEIK 66 Germline EIVMTQSPATLS RASQSVSSN WYQQKPGQ GAST GIPARFSGSGSGTEFT QQYNN FGQGTR VSPGERATLSC LA APRLLIY RAT LTISSLQSEDFAVYYC WPLT LEIK 4.18.1k 52 L2 JK5 EIVMTQFPATLS RASQSVSSS WYQQTPGQ GAST GFPARFSGIGSGTEFT QQYGN FGQGTR MSPGERATLSC LA APRLLIY RST LTISSLQSEDFAVYYC WPLT LEIK 67 Germline DIQMTQSPSSLS RASQGIRND WYQQKPGK AASS GVPSRFSGSGSGTEFT LQHNS FGGGTK ASVGDRVTITC LG APKRLIY LQS LTISSLQPEDFATYYC YT VEIK 2.6.1k 28 A30 JK4 DIQMTQSPSSLS RASQGIRND WYQQKPGK AASS GVPSRFSGSGSGTEFT LQHNS FGGGTR ASVGDRVTITC LG APKRLIY LQS LTISSLQPEDFATYYC YPLT VEIK 68 Germline DIVMTQSPDSLA KSSQSVLYS WYQQKPGQ WAST GVPDRFSGSGSGTDFT QQYYS FGGGTK VSLGERATINC SNNKNYLA PPKLLIY RES LTISSLQAEDVAVYYC TT VEIK 3.176.2k 40 B3 JK4 DIVMTQSPTSLT KSSQSVLYS WYQQKPRQ WAST GVPDRFSGSGSGTDFT QQYYT FGGGTK VSLGBRATINC SNNRNFLA PPKLLIY RES LTISSLQAEDVAVYYC TPLT VEIK 69 Germline DIQMTQSPSSVS RASQGISSW WYQQKPGK AASS GVPSRFSGSGSGTDFT QQANS FGQGTK ASVGDRVTITC LA APKLLIY LQS LTISSLQPEDFATYYC FPWT VEIK 3.8.3k 36 L5 JK1 DIQMTQSPSSVS RASQGISSW WYQQKPQK AASS GVPSRFSGSGSGTDFT QQADS FGQGTK ASIGDRVTITC LA TPKLLIY LQS LTISSLQPEDFATYYC FPWT VEIK

Example 16 Identification of uPAR Binding Epitopes

As the anti-uPAR antibodies failed to cross-react with mouse uPAR, we generated a number of mouse uPAR-human uPAR chimeric proteins to identify the domains involved in antibody binding. Chimeric human-murine uPAR comprising murine D1/humanD2D3; murine D1/human D2/MuD3; and human D1D2/murineD3uPAR each with a C-terminal His tag were expressed as secreted proteins in HEK293T cells. Binding sites for 2.6.1, 2.19.2, and 4.18.1 were determined by Western blotting of culture supernatants; expression of the appropriate recombinant proteins was demonstrated by detection using anti-His mAb. The binding epitope for 2.19.2 lies in Domain I, and 2.6.1 interacts primarily with an epitope within Domain II/III and 4.18.1 with an epitope in Domain II (see FIG. 6).

The nucleotide sequences encoding the proteins used for the epitope binning and the translated amino acid sequence are set forth in Table 20 below.

TABLE 20 Nucleotide and Amino Acid Sequences Used for Epitope Binning uPAR ECD Chimera Sequence SEQ ID NO: Murine D1/Human D2D3 Nucleotide Sequence SEQ ID NO: 83 Amino Acid Sequence SEQ ID NO: 84 Human D1D2/Murine D3 Nucleotide Sequence SEQ ID NO: 85 Amino Acid Sequence SEQ ID NO: 86 Murine D1/Human Nucleotide Sequence SEQ ID NO: 87 D2/Murine D3 Amino Acid Sequence SEQ ID NO: 88 Murine D1D2/Human D3 Nucleotide Sequence SEQ ID NO: 89 Amino Acid Sequence SEQ ID NO: 90

Example 17 Inhibition of Tumor Growth and Metastasis In Vivo

MDA MB231 cells stably expressing GFP (MDA MB231-GFP cells) were grown in culture and harvested at 85% confluence. A total of 5×10⁵ tumor cells were inoculated in saline/20% Matrigel™ into the mammary fat pad of female. Balb/c nu/nu mice. Three days post transplantation mice received the following; control non-specific isotype matched IgG4; doxorubicin Rx, 5 mg per kg i.p. once per week for two weeks; control or anti-human uPAR mAbs 0.5 mg per mouse i.p. once per week for the duration of the experiment. Tumor growth was measured once per week using calipers and tumor volumes calculated according to formula (a×b²/2), where a—is length of the long diameter, b—width of the perpendicular small diameter (FIG. 7). Untreated control tumor growth (not shown in FIG. 7) was not significantly different compared to IgG4 isotype controls.

At the end of the study, primary tumors were fixed, and lung, liver and spleen from control and experimental animals were removed for further analysis. Tissue sections were stained for the following proteins using standard immunohistochemical techniques: Ki67; CD31; MAPK; phospho-MAPK; FAK; phospho-FAK. Staining intensity was measured using BioQuant image analysis software and data was recorded from 6 animals per treatment group (FIG. 8).

Lung, liver and spleen tissues were similarly treated and tumor cells were identified by fluorescence microscopy and the numbers of metastases were recorded (FIG. 9).

As demonstrated by FIGS. 7-9, the anti-uPAR antibodies inhibited primary tumor growth and significantly inhibited the incidence of metastases to distant organs. Immunohistochemical examination of the primary tumors showed no effect against the proliferation marker Ki67 but there was a consistent inhibition in the levels of pMAPK and pFAK compared to controls. Unexpectedly, CD31 staining also showed some reduction in staining intensity although in the absence of antibody cross reactivity with murine uPAR the mechanism must be assumed to be indirect as a result of local tumor associated uPA activity.

Example 18 Immunohistochemistry

The binding profile of 2.6.1, 2.19.2 and 4.18.1 were evaluated together with an IgG4 isotype control antibody on frozen cell pellets and normal human tissue microarrays. (TriStar Technology Group). Mouse anti uPAR from American Diagnostica Inc., (Cat #: 3936, Lot #: 041223) was a positive control Ab in the study. Staining intensity was estimated by eye using a 0-3+ scale (± equivocal staining; 1+ weak staining; 2+ moderate staining; 3+ strong staining). Frozen cell pellets from PC3 human prostate cancer and U937 human histocytic lymphoma U937 cell pellets used as positive controls and both membrane and cytoplasmic staining was observed (See Table 21). Positive staining was reported only when staining was greater than and/or distinguishable from the background if the background staining was observed with the negative control antibody, or staining was in cells within the test tissue that did not stain with the negative control antibody (see Table 23 below).

TABLE 21 Staining Intenstity in Cell Pellets Abs IgG4 control 2.6.1 2.19.2 4.18.1 PC-3 — 2+ ± 3+ U937 — 2+ 2+ 1+

For staining of human tissue microarrays, 2.6.1, 2.19.2 and 4.18.1 were conjugated with Biotin, reassessed for binding to U937 cells (see Table 22 below) and then used to stain tissue microarrays.

TABLE 22 Staining Intenstity in Cell Pellets Using Biotin-Conjugated mAbs Abs IgG4 control 2.6.1 2.19.2 4.18.1 U937 — 2+ 2+ 2+

Tissue microarrays were stained at a concentration of 20 μg per ml biotin conjugated antibody. The results are shown in Table 23. Where indicated c=cytoplasmic and m=membrane staining pattern.

TABLE 23 Tissue Microarray Staining Pattern Tissue Type 2.6.1 20 ug 2.19.2 20 ug 4.18.1 20 ug liver inflammation cells3+ (c) inflammation cells 3+ (c) inflammation cells 2+ (m, c) liver inflammation cells3+ (c) inflammation cells 3+ (c) inflammation cells 2+ (m, c) liver inflammation cells3+ (c) inflammation cells 2+ (c) inflammation cells 1+ (c) liver inflammation cells2+ (c), inflammation cells 1+ (c), inflammation cells 1+ (c) stroma1+ stroma1+ liver inflammation cells 3+ (c) inflammation cells 2+ (c) inflammation cells 1+ (c) liver inflammation cells 3+ (c) inflammation cells 2+ (c) inflammation cells 1+ (c) pancreas acinar cells 2+ (c) acinar cells 2+ (c) acinar cells 1+ (c) pancreas acinar cells 3+ (c) acinar cells 2+ (c) acinar cells 1+ (c) pancreas acinar cells 2+ (c) acinar cells 2+ (c) acinar cells 1+ (c) pancreas acinar cells 1+ (c) acinar cells 2+ (c) acinar cells 1+ (c) pancreas acinar cells 1+ (c) fibroblast 1+ (c) inflammation cells 2+ (c) pancreas acinar cells 1+ (c) acinar cells 1+ (c) inflammation cells 1+ (c) colon mucosa epithelium1+ negative inflammation cells 2+ (c) colon mucosa epithelium1+ epithelium1+ (c) inflammation cells 2+ (m, c) colon mucosa negative negative negative colon mucosa epithelium1+ inflammation cells 1+ (c) inflammation cells 2+ (m, c) colon mucosa epithelium1+ epithelium 1+ (c) epithelium1+ (c), inflammation cells 1+ (c) colon mucosa epithelium1+ epithelium 1+ (c) epithelium1+ (c), inflammation cells 1+ (c) colon muscularis negative negative inflammation cells 1+ (c) colon muscularis lymphocytes 1+ (c) negative inflammation cells 1+ (c) colon muscularis negative inflammation cells 1+ (c) negative colon muscularis negative nerve 1+ negative colon muscularis negative inflammation cells 1+ (c) inflammation cells 1+ (c) colon muscularis nerve 1+ nerve 1+ negative kidney cortex negative negative negative kidney cortex negative negative negative kidney cortex glomerulus 1+ (c) glomerulus 1+ (c) glomerulus 1+ (c) kidney cortex glomerulus 1+ (c) glomerulus 1+ (c) glomerulus 1+ (c) kidney cortex glomerulus 1+ (c) negative inflammation cells 1+ (c) kidney cortex glomerulus 1+ (c) inflammation cells 1+ (c) inflammation cells 1+ (c) kidney medulla negative negative negative kidney medulla negative inflammation cells 1+ (c) inflammation cells 1+ (c) kidney medulla negative negative negative kidney medulla negative negative negative kidney medulla negative negative negative kidney medulla negative negative inflammation cells 1+ (c) lung alveoli epithelium 2+ (m) epithelium 2+ (m, c) epithelium 1+ (m, c), inflammation cells 1+ (c) lung alveoli epithelium 3+ (m, c) epithelium 3+ (m, c) epithelium 2+ (m, c), inflammation cells 2+ (c) lung alveoli epithelium 3+ (m, c) epithelium 3+ (m, c) epithelium 2+ (m, c), inflammation cells 2+ (c) lung bronchus epithelium 1+ (c) lung bronchus negative negative lung bronchus epithelium 1+ (c) epithelium 1+ (c) inflammation cells 1+ (c) lung bronchus non-specific staining inflammation cells 2+ (c) inflammation cells 1+ (c) lung bronchus epithelium 1+ (c) inflammation cells 2+ (c) inflammation cells 1+ (c) lymph node lymphocytes 3+ (m.c) lymphocytes 2+ (m.c) lymphocytes 1+ (m.c) lymph node lymphocytes 3+ (m.c) lymphocytes 3+ (m.c) lymphocytes 1+ (m.c) lymph node lymphocytes 2+ (m.c) lymphocytes 2+ (m.c) lymphocytes 1+ (m.c) lymph node lymphocytes 2+ (m.c) lymphocytes 2+ (m.c) lymphocytes 1+ (m.c) lymph node lymphocytes 2+ (m.c) lymphocytes 3+ (m.c) lymphocytes 1+ (m.c) heart negative negative negative heart negative negative inflammation cells 1+ (c) heart negative negative inflammation cells 1+ (c) heart negative negative inflammation cells 1+ (c) heart negative negative negative

Example 19 Inhibition of Tumor Cell Growth in Human Patients

A group of human cancer patients diagnosed with pancreatic cancer is randomized into treatment groups. Each patient group is treated with weekly intravenous injections of mAb 2.6.1, 2.19.2 or 4.18.1 described herein. Each patient is dosed with an effective amount of the antibody ranging from 5 mg/kg/week to 15 mg/kg/week for 4-8 months. A control group is given only the standard chemotherapeutic regimen.

At periodic times during and after the treatment regimen, tumor-burden is assessed by magnetic resonance imaging (MRI). It is found that the patients who have received weekly antibody treatment with mAb 2.6.1, 2.19.2 or 4.18.1 show significant reductions in tumor size, time delay to progression or prolonged survival compared to patients that do not receive antibody treatment. In some treated patients, the tumors are no longer detectable. In contrast, tumor size increases or remains substantially the same in the control group.

Example 20 Inhibition of Tumor Cell Growth in a Human Patient

A group of human cancer patients diagnosed with thyroid cancer is randomized into treatment groups. Each patient group is treated 3-weekly with intravenous injections of mAb 2.6.1, 2.19.2 or 4.18.1 described herein and gemcitabine. Each patient is dosed with an effective amount of the antibody ranging from 5 mg/kg/week to 15 mg/kg/week for 4-8 months and an effective therapeutic dose of gemcitabine. A control group is given only the standard chemotherapeutic regimen. At periodic times during and after the treatment regimen, tumor burden is assessed by magnetic resonance imaging (MRI). It is found that the patients who have received 3-weekly antibody treatment with mAb 2.6.1, 2.19.2 or 4.18.1 and gemcitabine show significant reductions in tumor size, time delay to progression or prolonged survival compared to patients that do not receive antibody and gemcitabine treatment. In some treated patients, the tumors are no longer detectable. In contrast, tumor size increases or remains substantially the same in the control group.

Example 21 Inhibition of Tumor Metastasis in Human Patients

A group of human cancer patients diagnosed with non-small cell lung cancer is randomized into treatment groups. In addition to a standard chemotherapeutic regimen, each patient group is treated with weekly intravenous injections of mAb 2.6.1, 2.19.2 or 4.18.1 described herein. Each patient is dosed with an effective amount of the antibody ranging from 5 mg/kg/week to 15 mg/kg/week for 2-8 months. A control group is given only the standard chemotherapeutic regimen.

At periodic times during and after the treatment regimen, metastatic lesions are assessed by positron emission tomography (PET). It is found that the patients who have received weekly antibody treatment with mAb 2.6.1, 2.19.2 or 4.18.1 show significant reductions in the number and size of metastatic lesions, compared to patients that do not receive antibody treatment.

Example 22 Treatment of Estrogen Receptor Positive Breast Cancer in a Human Patient

An adult female is diagnosed with estrogen receptor positive breast cancer. The patient is treated every 2 weeks with intravenous injections of mAb 2.19.2 and an anti-hormonal agent over a period of 2-8 months. As a result, the patient experiences prolonged progression free survival.

Example 23 Treatment of HER2 Positive Breast Cancer in a Human Patient

An adult female is diagnosed with HER2 positive breast cancer. The patient is treated every week with intravenous injections of mAb 2.19.2 and an anti-her2 agent over a period of 2-8 months. As a result, the patient experiences a significant reduction in tumor size.

Example 24 Treatment of EGFR-Expressing Lung Cancer in a Human Patient

An adult male is diagnosed with EGFR-expressing lung cancer. The patient is treated weekly with intravenous injections of mAb 2.19.2 and a receptor tyrosine kinase inhibitor over a period of 2-8 months. As a result, the patient experiences a significant delay in time to progression.

Example 25 Treatment of Arthritis in a Human Patient

An adult female is diagnosed with severe arthritis. The patient is treated with intravenous injections every 2 weeks of mAb 2.19.2 over a period of 3 weeks. As a result, the patient experiences a significant reduction in the symptoms of arthritis.

Example 27 Treatment of Atherosclerosis in a Human Patient

An adult male is diagnosed with atherosclerosis. The patient is treated with intravenous injections every other week of mAb 4.18.1 over a period of a year. As a result, the patient experiences a reduction in the symptoms of atherosclerosis, such as angina pectoris.

INCORPORATION BY REFERENCE

All references cited herein, including patents, patent applications, papers, text books, and the like, and the references cited therein, to the extent that they are not already, are hereby incorporated herein by reference in their entirety.

EQUIVALENTS

The foregoing written specification is considered to be sufficient to enable one skilled in the art to practice the invention. The foregoing description and Examples detail certain preferred embodiments of the invention and describes the best mode contemplated by the inventors. It will be appreciated, however, that no matter how detailed the foregoing may appear in text, the invention may be practiced in many ways and the invention should be construed in accordance with the appended claims and any equivalents thereof. 

1. An isolated targeted binding agent that specifically binds to urokinase-type plasminogen activator receptor (uPAR) and inhibits binding of urokinase-type plasminogen activator (uPA) to uPAR. 2-63. (canceled) 